Develop Bugs

Fastboot is lost to my phone

Recently I soft-bricked my LG Optimus G (e975) and used KDZ updater to re-install original firmware. after re-rooting the phone with framaroot i can no longer enter fastboot mode on my phone. I typed in the command on adb to reboot into fastboot but the phone's response is to go ahead and trigger a normal reboot. I tried using teh button combinations to get into fastboot to no avail. its as if fastboot has just vanished off my phone.

Sylexision said:
Recently I soft-bricked my LG Optimus G (e975) and used KDZ updater to re-install original firmware. after re-rooting the phone with framaroot i can no longer enter fastboot mode on my phone. I typed in the command on adb to reboot into fastboot but the phone's response is to go ahead and trigger a normal reboot. I tried using teh button combinations to get into fastboot to no avail. its as if fastboot has just vanished off my phone.
Click to expand...
Click to collapse
Now that your phone is rooted, install freegee from playstore to unlock your device. Use Freegee to unlock your phone's bootloader, you will be asked in freegee whether to install CWM or TWRP as a recovery. After choosing, it will install the recovery. The recovery has fastboot.

I wish that worked
Funny thing is i tried FreeGee already and it forces my phone to a playstore app called busybox or something like that. if i press the back button to get back to the app it goes crazy and runs a window telling me "Tried twice to copy utilities and it failed" then my phone reboots. (Screenshot is attatched)

Sylexision said:
Funny thing is i tried FreeGee already and it forces my phone to a playstore app called busybox or something like that. if i press the back button to get back to the app it goes crazy and runs a window telling me "Tried twice to copy utilities and it failed" then my phone reboots. (Screenshot is attatched)
Click to expand...
Click to collapse
Just try it again. I got that error before, but after few tries, it worked.
OR
Try to turn off your phone, then press Vol up + power button. This is for fastboot.

Ive tried a lot of times and it still isnt working
Doing that just brings me to stock recovery

Sylexision said:
Funny thing is i tried FreeGee already and it forces my phone to a playstore app called busybox or something like that. if i press the back button to get back to the app it goes crazy and runs a window telling me "Tried twice to copy utilities and it failed" then my phone reboots. (Screenshot is attatched)
Click to expand...
Click to collapse
Go to Play Store and install BusyBox. It's pretty much an essential component for a rooted device, anyway. There are several BusyBox installers, I would suggest the one by Stericson. Then try FreeGee again.

THANK YOU
Well as obvious as that solution may have seemed i (just as obviously) never thought of it. Thanks for the suggestions and the patience. it worked :laugh:

Sylexision said:
Well as obvious as that solution may have seemed i (just as obviously) never thought of it. Thanks for the suggestions and the patience. it worked :laugh:
Click to expand...
Click to collapse
Good for you. :laugh:

Sylexision said:
Well as obvious as that solution may have seemed i (just as obviously) never thought of it. Thanks for the suggestions and the patience. it worked :laugh:
Click to expand...
Click to collapse
How did you solve it? I have the same problem.

I had the problem too. I just rooted with Framaroot, then installed SuperSU, FreeGee & Busybox... Ran busybox and granted permission, once busybox installed then ram freegee, took backup of EFS, installed CWM via MAKO method. And then flashed PHILZTOUCH & am now running CM11
Sent from my LG-E975 powered by my OWN CyanogenMod 11 port

[Q] TWRP + OTA update = bootloop! help needed!

Hello everyone,
Today showed up on my Gpad an update that automatically started to download.
So I thought ''if it is downloading, why don't I give it a try?''
Big mistake.
I am rooted with TWRP 2.7.0.0 and stock 4.4.2 rom..
My Gpad after I press confirm it tried to reboot. After the device shut down and try to power on, it stuck in a bootloop on TWRP.
Every time I try to power it off and then power it back on it starts on TWRP and stay there even if I press reboot on TWRP it does the same loop.
After this idiotic move of mine I would like to have help from someone who knows how to restore the device..
Also is there any way to restore the device in TWRP or to do the update manually from the file that is already downloaded in my device
(from TWRP)?
Any help would be very very appreciated!

alekos1992 said:
Hello everyone,
Today showed up on my Gpad an update that automatically started to download.
So I thought ''if it is downloading, why don't I give it a try?''
Big mistake.
I am rooted with TWRP 2.7.0.0 and stock 4.4.2 rom..
My Gpad after I press confirm it tried to reboot. After the device shut down and try to power on, it stuck in a bootloop on TWRP.
Every time I try to power it off and then power it back on it starts on TWRP and stay there even if I press reboot on TWRP it does the same loop.
After this idiotic move of mine I would like to have help from someone who knows how to restore the device..
Also is there any way to restore the device in TWRP or to do the update manually from the file that is already downloaded in my device
(from TWRP)?
Any help would be very very appreciated!
Click to expand...
Click to collapse
Did you not make a back up after rooting your tablet? If so, simply restore from your backup.

generally, it is advised that before you update a rooted device's ROM, to create a nandroid backup first, just to be sure. As OTA's from non-OEM's aren't as stable as OEM's, nor do they provide warranty if you get stuck in a boot loop. To fix the issue, download your ROM image to the "root" of your microSD, go to recovery, wipe cache/dalvik cache, then try to install the ROM image. If it still fails, I'm afraid you may need to do a fresh install (wipe the device fully, before making a fresh install of your ROM.). This should fix your problem, though you loose your data. Unfortunately, thats one of the risks of modifying our devices. One that I had to learn the hard way (by hard, I mean hard brick).
At any rate, hope this helps.

Thanks for the quick reply guys!
I have not made a backup of my files.
So now I'm downloading slimkat for a little change..
(also is there a way to create a backup of my files with TWRP and restore them on Slimkat?)
[UPDATE]
I wiped cache / dalvik and then install the Slimkat ROM but the same problem persists, then I did a factory reset from TWRP
and then install the ROM, but still the same
Is there any way to unroot your device from the PC?

alekos1992 said:
Thanks for the quick reply guys!
I have not made a backup of my files.
So now I'm downloading slimkat for a little change..
(also is there a way to create a backup of my files with TWRP and restore them on Slimkat?)
Click to expand...
Click to collapse
I don't have my tablet with me to check for you, however, I am pretty sure I found a file explorer within TWRP. Perhaps you may be able to copy from there. Explore the tool abit its quite user friendly and well made. Otherwise, you can make a nandroid backup to create a full backup of your system and try to extract from PC via WinRAR (if the backup is in tar), or some explorer app... see below for details:
http://forums.anandtech.com/showthread.php?t=2262350
or this one:
http://forum.xda-developers.com/showthread.php?t=2099493
hope this helps

jarod004 said:
I don't have my tablet with me to check for you, however, I am pretty sure I found a file explorer within TWRP. Perhaps you may be able to copy from there. Explore the tool abit its quite user friendly and well made. Otherwise, you can make a nandroid backup to create a full backup of your system and try to extract from PC via WinRAR (if the backup is in tar), or some explorer app... see below for details:
http://forums.anandtech.com/showthread.php?t=2262350
or this one:
http://forum.xda-developers.com/showthread.php?t=2099493
hope this helps
Click to expand...
Click to collapse
Thanks for the tip, I'm sure it will help me in a future failure!
I have already done everything you said without succeeding anything ,so I'm trying to un-brick it with LG's support tool
and I can not get it to recognize my connected Gpad, so I put manually the model and serial number but still it can't see any connected devices...
Now I'm 100% stuck :/

alekos1992 said:
Thanks for the tip, I'm sure it will help me in a future failure!
I have already done everything you said without succeeding anything ,so I'm trying to un-brick it with LG's support tool
and I can not get it to recognize my connected Gpad, so I put manually the model and serial number but still it can't see any connected devices...
Now I'm 100% stuck :/
Click to expand...
Click to collapse
sorry for what happened. have you tried to wipe all data, and all cache then try to do a fresh rom installation? I am not sure why LG cannot see your device. But a wild guess is its something about your recovery because its no longer stock perhaps???
if you can reach recovery, you should be able to fix the issue by wiping all the data (except external SD), wiping all cache (including dalvik), then install your custom ROM. Have happened to me already although different cause from yours but I was still able to restore it although I did loose all my data. But as I said before, its the price to pay for tinkering with our devices.

Hello guys,
Same problem for me, Stock 4.4.2 with TWRP, the OTA update make my GPad boot only on TWRP, no way to get my system back.
I try this one : http://forum.xda-developers.com/showthread.php?t=2772902
Successful My GPad is booting correctly on Android !

Damn!! I read to late your answer, I install a couple of minutes ago the complete stock 4.4.2 V50020d from LG's support tool.
In a previous post I said I was stuck but not really.. I forgot that I have to press volume + and volume - while connectiong the USB cable to enter download mode
But everyone having the same problem with me should really give a try to what JaymZ37 said above.
Peace to everyone and thanks for your replies!

Soloution for Boot Loop problem on LG Gpad V500
alekos1992 said:
Hello everyone,
Today showed up on my Gpad an update that automatically started to download.
So I thought ''if it is downloading, why don't I give it a try?''
Big mistake.
I am rooted with TWRP 2.7.0.0 and stock 4.4.2 rom..
My Gpad after I press confirm it tried to reboot. After the device shut down and try to power on, it stuck in a bootloop on TWRP.
Every time I try to power it off and then power it back on it starts on TWRP and stay there even if I press reboot on TWRP it does the same loop.
After this idiotic move of mine I would like to have help from someone who knows how to restore the device..
Also is there any way to restore the device in TWRP or to do the update manually from the file that is already downloaded in my device
(from TWRP)?
Any help would be very very appreciated!
Click to expand...
Click to collapse
Yesterday its hapen to me the same ptoblem.......
after searching i fount the soloution and they work perfect !!!!
>>>>>>>
I saw this thread: http://forums.androidcentral.com/gen...load-mode.html
"What worked for me was from the TWRP terminal command to the Root folder and was type
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/fota
(they have space on ....... dd_if=/dev/zero_of=dev....... only)
then hit enter
type
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/misc
(the same here)
then hit enter and reboot."
<<<<<<<<<

Here's the original solution given in our forum:
[FIX] Installed TWRP and now you're stuck after OTA?
And the additional command was given in this post by brentkhack:
What worked for me was from the TWRP terminal command was to type
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/fota
then hit enter
type
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/misc
then hit enter and reboot.
got help from the IRC xda-devs for the second step to complete the fix.
Click to expand...
Click to collapse

heliox said:
Here's the original solution given in our forum:
[FIX] Installed TWRP and now you're stuck after OTA?
And the additional command was given in this post by brentkhack:
Click to expand...
Click to collapse
Oh man that worked, just about to give my tablet to gran dad and got stucked, thanks for this!

[Q] Bricked Gpad 8.3 - stock rom via LG Flash Tool not working

So. Recently, I got CyanogenMod 13 on my Gpad. Everything was just fine. Then I installed the Magisk Manager, which, for some reason, disabled the root access on the device. When I uninstalled it, my recovery (TWRP) asked me, if I want to install SuperSU. I selected yes. And that's the moment when everything fcked up. After SuperSU installation, my tablet went into bootloop, and I wasnt't even able to enter recovery via button combination. I tried to flash the stock rom via LG Flash Tool, but failed miserably. I tried multiple stock roms, but the result is till the same: I can't access the Factory Reset via buttons, the system keeps rebooting, and even if it boots for few seconds, the touchscreen isn't responding. I even tried connecting mouse via USB otg, but no success. Is my tablet dead? Is there any chance of repairing it?
Thank you for your help.
EDIT: It's v500 European version.

Czechball said:
So. Recently, I got CyanogenMod 13 on my Gpad. Everything was just fine. Then I installed the Magisk Manager, which, for some reason, disabled the root access on the device. When I uninstalled it, my recovery (TWRP) asked me, if I want to install SuperSU. I selected yes. And that's the moment when everything fcked up. After SuperSU installation, my tablet went into bootloop, and I wasnt't even able to enter recovery via button combination. I tried to flash the stock rom via LG Flash Tool, but failed miserably. I tried multiple stock roms, but the result is till the same: I can't access the Factory Reset via buttons, the system keeps rebooting, and even if it boots for few seconds, the touchscreen isn't responding. I even tried connecting mouse via USB otg, but no success. Is my tablet dead? Is there any chance of repairing it?
Thank you for your help.
EDIT: It's v500 European version.
Click to expand...
Click to collapse
nope, it's not death (yet)... The buttoncombo to enter might be a problem, but keep trying. If really nothing goes, try connecting to your PC and open a commandline. Type : adb reboot recovery (preferably from a linuxbox). However, make sure you got a ROM, GApps and SU system 2.78 or 2.79 ready on the SD. Personally I recommend @adrianom AOSP 7.1.1, OpenGApps micro and SU 2.79 SR2'systemmode.
Cheers

dirlan2001 said:
nope, it's not death (yet)... The buttoncombo to enter might be a problem, but keep trying. If really nothing goes, try connecting to your PC and open a commandline. Type : adb reboot recovery (preferably from a linuxbox). However, make sure you got a ROM, GApps and SU system 2.78 or 2.79 ready on the SD. Personally I recommend @adrianom AOSP 7.1.1, OpenGApps micro and SU 2.79 SR2'systemmode.
Cheers
Click to expand...
Click to collapse
Thank you for your reply.
However:
I am not able to stay in the system.
I am not able to enter the recovery. (because of the brick)
I am not able to enter ADB, because there's just no way how. I have USB debugging disabled by default (because I tried to reset the system using LG Flash Tool) and I can't use ADB in the download mode.
Actually, download mode is the only thing that hasn't broke yet. I still hope that someone that has experienced similar problems help me.
But again, thanks for your (and the only) reply.

Czechball said:
Thank you for your reply.
However:
I am not able to stay in the system.
I am not able to enter the recovery. (because of the brick)
I am not able to enter ADB, because there's just no way how. I have USB debugging disabled by default (because I tried to reset the system using LG Flash Tool) and I can't use ADB in the download mode.
Actually, download mode is the only thing that hasn't broke yet. I still hope that someone that has experienced similar problems help me.
But again, thanks for your (and the only) reply.
Click to expand...
Click to collapse
If you can get into download, you could connect to a PC and start the LG-tools.Use that to restore to the original ROM and start allover again with latedt software (TWRP, ROM, SU)
Cheers

[US998] TWRP unofficial alpha [Feb.17.2018]

TWRP for US998 (not US-Cellular)
I have simply used existing sources from @jcadduono so thanks to him for the h930 version that simply works on our US998 devices.
All i have done here is changed props to read us998 instead of h930, so asserts should work and labeling on a pc will be correct etc. I don't intend to maintain or build any other versions.
The purpose of this modified twrp and this thread is to provide less confusion for new users of the US998 and for what version of twrp to flash, as the h930 thread appears to be abandoned.
Flashing instructions
1. Unlock your bootloader
2. Fastboot flash the twrp img onto your device - (fastboot flash recovery twrp_us998.img)
Don't let the device boot into system or you will need to fastboot flash again, you need to do the button combo to get into recovery quickly before it automatically boots.
3. Flash a root method or a dm-verity disabler zip.
4. You will probably need to format your data partition before it will boot into system. Because of encryption.
DOWNLOAD - twrp_us998.img
This is built using @jcadduono sources from the H930 version of TWRP found here
Kernel - https://github.com/jcadduono/android_kernel_lge_msm8998/commits/twrp-7.1 and
Device treer - https://github.com/jcadduono/android_device_lge_h930
--->

PayPal donation made for US998 TWRP and the WETA ROM. Thank you.
Question: just like the H930 TWRP worked for bootloader unlocked US998 V30, would this TWRP also work for bootloader unlocked H930/H930G or ANY OTHER LG V30/V30+ variants if they ever got bootloader unlock and full flash commands?

ChazzMatt said:
PayPal donation made for US998 TWRP and the WETA ROM. Thank you.
Question: just like the H930 TWRP worked for bootloader unlocked US998 V30, would this TWRP also work for bootloader unlocked H930/H930G or ANY OTHER LG V30/V30+ variants if they ever got bootloader unlock and full flash commands?
Click to expand...
Click to collapse
This uses the same sources as h930 so will work for both, though is simply set up for us998. I didn't change anything except device fingerprints
[emoji450]--->

Mentalmuso said:
This uses the same sources as h930 so will work for both, though is simply set up for us998. I didn't change anything except device fingerprints
[emoji450]--->
Click to expand...
Click to collapse
OK, just asking for future. Especially if you update this TWRP and the other one is never updated... Or if another LG V30/V30+ variant gets bootloader unlock and full flash commands through exploit.
I remember when Sunshine team unlocked the bootloader to Droid Turbo XT1254 in November 2015, one of the Motorola Quark variants. One of the Sunshine devs asked "Who can quickly build me a TWRP to work with this?" NO NEED. Quark already had OFFICIAL TWRP! And yes, it worked just fine on the Droid Turbo. Problem was, the XDA mods had split the Quark forums just two months prior (due to locked down Droid Turbo owner complaints; they were tired of seeing custom ROMs, kernels, etc.) -- so all the dev work for the OTHER bootloader unlocked Quarks (XT1225, XT1250) had disappeared, moved to a different location. Very ironic. To this day, Droid Turbo owners mostly have to go over to the Moto Maxx/Moto Turbo forum to get custom ROMs which are fully compatible with their phones. It's just all the dev work is posted over there, because they didn't want to see any dev work -- until their bootloader got unlocked, of course.
So, I'm glad all the LG V30/V30+ are together.

Can't wait to actually use this on my v30+!

Flashing instructions
1. Unlock your bootloader
2. Fastboot flash the twrp img onto your device - (fastboot flash recovery twrp_us998.img)
Don't let the device boot into system or you will need to fastboot flash again, you need to do the button combo to get into recovery quickly before it automatically boots.
3. Flash a root method or a dm-verity disabler zip.
4. You will probably need to format your data partition before it will boot into system. Because of encryption.
Hey Sorry about this but not to be a real dummy but can you tell me/us I know we are still in fastboot mood can you tell us what the button combo is to get back into recovery because I'm not real sure about it

foamerman said:
Flashing instructions
1. Unlock your bootloader
2. Fastboot flash the twrp img onto your device - (fastboot flash recovery twrp_us998.img)
Don't let the device boot into system or you will need to fastboot flash again, you need to do the button combo to get into recovery quickly before it automatically boots.
3. Flash a root method or a dm-verity disabler zip.
4. You will probably need to format your data partition before it will boot into system. Because of encryption.
Hey Sorry about this but not to be a real dummy but can you tell me/us I know we are still in fastboot mood can you tell us what the button combo is to get back into recovery because I'm not real sure about it
Click to expand...
Click to collapse
Oh yeah, simply holding power and volume down simultaneously, as soon as you see the LG logo, let go of power button for a brief moment and re-press it until you see twrp boot up.
[emoji450]--->

Mentalmuso said:
Oh yeah, simply holding power and volume down simultaneously, as soon as you see the LG logo, let go of power button for a brief moment and re-press it until you see twrp boot up.
[emoji450]--->
Click to expand...
Click to collapse
Thank you Sir I"m new to the LG phone didn't know how to do it.

Just did a system backup but failed. chose External Sdcard since it could not mount internal memory. It ran well when backuping system but when the process of creating system image lasted For some time, the mission was automatically aborted. could not figure out why.

Moriatier said:
Just did a system backup but failed. chose External Sdcard since it could not mount internal memory. It ran well when backuping system but when the process of creating system image lasted For some time, the mission was automatically aborted. could not figure out why.
Click to expand...
Click to collapse
I've been doing backups to internal since day one. Never tried an external card backup. I can't help much as i simply used the source code from the h930 twrp, and never intended to fix or update anything. It was a confusion eliminating build so us998 users knew what to flash

so is there any reason i should update this over the h930 version?

VR32 said:
so is there any reason i should update this over the h930 version?
Click to expand...
Click to collapse
Nope. Not unless you want your PC to say us998 instead of h930 when plugged in in recovery mode.

Moriatier said:
Just did a system backup but failed. chose External Sdcard since it could not mount internal memory. It ran well when backuping system but when the process of creating system image lasted For some time, the mission was automatically aborted. could not figure out why.
Click to expand...
Click to collapse
You cant mount your internal memory because its encrypted with LGs own encryption, and TWRP cant decrypt that.
Solution would be: format internal data, flash the no-verity-opt-encrpyt zip (other twrp thread has a link), and start from new
And the system image backup isnt really needed, except you want to flash it via fastboot (i leave that out always)

can i ask you to upload to google drive or something ebcause androidfilehost seems to be slow compared to downloading from the likes of mega or google drive

Edit: Nevermind

Hi,
Looking for some help getting twrp running. Bootloader is confirmed unlocked.
After the fastboot flash command, it successfully writes twrp.
Then i hold power and volume down, when i see the LG logo, i briefly let up on power and hold it again.
Then instead of seeing twrp, I see the "factory data reset" screen (and the choices are no or yes)
Then it doesn't seem to matter what i choose, I cannot seem to make it into twrp.
can anyone see what I'm doing wrong here?
Thanks

glhelinski said:
Hi,
Looking for some help getting twrp running. Bootloader is confirmed unlocked.
After the fastboot flash command, it successfully writes twrp.
Then i hold power and volume down, when i see the LG logo, i briefly let up on power and hold it again.
Then instead of seeing twrp, I see the "factory data reset" screen (and the choices are no or yes)
Then it doesn't seem to matter what i choose, I cannot seem to make it into twrp.
can anyone see what I'm doing wrong here?
Thanks
Click to expand...
Click to collapse
you should have chosen yes

Thanks for the help!! I seem to have another issue. I got past the issue above, then twrp asked for a password/pin (which i removed before I started this whole thing.)
In twrp, i flashed magisk 16, the dm-verity zip and rctd disabler. Now when I reboot, it looks like android is starting but it tells me "Encryption unsuccessful. The password you entered is corrupt but unfortunately your data is corrupt. To resume using your phone, you need to perform a factory reset. When you set up your phone after the reset, you'll have an opportunity to restore any data that was backed up to your Google account"
And there is a "Reset Phone" button....which I click but it just goes back to TWRP and now i'm stuck.
This may not be the correct place to post for help but can anyone help please?
Thanks

glhelinski said:
Thanks for the help!! I seem to have another issue. I got past the issue above, then twrp asked for a password/pin (which i removed before I started this whole thing.)
In twrp, i flashed magisk 16, the dm-verity zip and rctd disabler. Now when I reboot, it looks like android is starting but it tells me "Encryption unsuccessful. The password you entered is corrupt but unfortunately your data is corrupt. To resume using your phone, you need to perform a factory reset. When you set up your phone after the reset, you'll have an opportunity to restore any data that was backed up to your Google account"
And there is a "Reset Phone" button....which I click but it just goes back to TWRP and now i'm stuck.
This may not be the correct place to post for help but can anyone help please?
Thanks
Click to expand...
Click to collapse
In TWRP you need to reformat your partition, not just "wipe". See point #7. Even though they say "wipe", they also admit it's reformat data. And then you have all the stuff you need on your microSD card and can pull from that. (Very important!)
[GUIDE][LGV30]Unlocking and Rooting - TWRP/Magisk Step-by-Step
https://forum.xda-developers.com/lg-v30/help/unlocking-rooting-twrp-magisk-step-step-t3745006

ChazzMatt said:
In TWRP you need to reformat your partition, not just "wipe". See point #7. Even though they say "wipe", they also admit it's reformat data. And then you have all the stuff you need on your microSD card and can pull from that. (Very important!)
[GUIDE][LGV30]Unlocking and Rooting - TWRP/Magisk Step-by-Step
https://forum.xda-developers.com/lg-v30/help/unlocking-rooting-twrp-magisk-step-step-t3745006
Click to expand...
Click to collapse
thanks. that worked for me. in somewhat of a panic i violated the rule of not searching

TWRP recovery not working on Blackview BV9500

Hi everybody,
I try to root my Blackview BV9500 by installing first TWRP recovery. I use fastboot mode on a linux laptop to do that.
I successfully flash the twrp recovery image, but after that, the phone don't boot in recovery anymore.
It try to boot into recovery, but it reboot in normal mode a few second after.
I tried also with the cmd "fastboot boot recovery.img".
When i flash back the original recovery image, it work, i can boot the original recovery without any problem.
Does anyone have the problem?
Some one can help me to find a solution?

I, too, am trying to do this. I have not yet flashed it... I was going to use the fastboot boot command to boot the recovery kernel before permanently flashing it, to make sure it would work, and in my googling I stumbled across this post. Serendipity! [Edit 3: Although, reading your post again, I see you tried that as well and it didn't succeed for you. For me, it simply tells me remote: command not found, so how were you able to even get that to work?]
All that said... I have the BV9500 Pro, specifically for the two-way radio, so I'm going to try to keep that little tidbit of hardware working in the process. I mainly just want to tweak the menus a bit, tweak the quick settings, get root, delete the Google crapps I won't be using...
On to your problem, though, I can't help much but maybe if we post back and forth our successes and failures we might be able to stumble through it together?
First, I assume you already have unlocked your bootloader? [Edit: Honestly, I'm not sure flashing the recovery would be allowed without first unlocking the bootloader]
[Edit 2: Perhaps this thread might be of help. Different model, but often the hardwares used by manufacturers are similar enough that the same steps generally work. ]

Thank you for the link, maybe i need to flash the complete rom with the twrp recovery with spflash tools, and it will work.
I will try and let you know, but i will make a backup of my rom before flashing it!
For your problem with fastboot, maybee it's because you need to install it. You can use the command "sudo apt-get install fastboot" on a terminal window if you are on linux.
If you want to enter the recovery mode, you don't need to use fastboot, you can simply enter it by pressing Volume Up and Power buttons together for a couple of seconds when your phone is off.
When Boot Mode appears release all keys.
To flash recovery with fastboot, you need first to enable the developer mode on your phone (go to "Settings > About phone" and make 7th tap on the build number, the Developer options will be unlocked and available), and unlock the bootloader of course.
here what is the process i made to flash the recovery :
- i use the command "adb devices" to check if the phone is well connected. (response is like "BV9500S320001179 device")
- then i enter in fastboot mode with "adb reboot bootloader" (phone reboot and ask confirmation for fastboot mode)
- check with command "fastboot devices"
- unlock the bootloader with the command "fastboot oem unlock" or "fastboot flashing unlock".
- flash the phone with the twrp recovery with "fastboot flash recovery recovery.img"
- reboot the phone in recovery mode with "fastboot boot recovery.img"
Normally the phone boot in twrp recovery.
Hope that will help you too.

I am too facing this problem. In case you got any solutions please let me know too.

Yves596 said:
For your problem with fastboot, maybee it's because you need to install it. You can use the command "sudo apt-get install fastboot" on a terminal window if you are on linux.
Click to expand...
Click to collapse
Yup. Already had fastboot installed for the LG G5 this phone replaced, the Galaxy Note 4 the LG replaced, the MyTouch 4G Slide the Galaxy replaced, my wife's old Galaxy S5 I used in the interims... LOL, I've got a working install. No, the "Remote: command not found" was returned from within.... Whether fastboot or adb, I forget now, but I was able to get the file to flash eventually, after reading your first post, but unfortunately the phone would not boot to it (nor Android). I thought I'd bricked it. Twice this happened. Each time, after about 5 minutes, it eventually booted to Android.
I flashed the recovery from the ROM in the link Blackview sent me and was able to boot their recovery just fine, so there's something in the TWRP that my particular phone doesn't like.
If you want to enter the recovery mode, you don't need to use fastboot, you can simply enter it by pressing Volume Up and Power buttons together for a couple of seconds when your phone is off.
When Boot Mode appears release all keys.
Click to expand...
Click to collapse
Thanks, I keep forgetting which keys to hold for recovery versus bootloader, so I use the adb command to be sure without having to keep a notepad nearby.
Clearly I don't do this as often as I used to.
(snip)
- flash the phone with the twrp recovery with "fastboot flash recovery recovery.img"
- reboot the phone in recovery mode with "fastboot boot recovery.img"
Normally the phone boot in twrp recovery.
Hope that will help you too.
Click to expand...
Click to collapse
Now that was something I haven't done since the T-Mobile G1 days. My understanding was that you CAN boot a recovery without flashing it first if you"fastboot boot {image filename}" but that didn't work for me either. I'm also assuming that the filename to flash can be anything because the device stores it to a partition, so it shouldn't have to be specifically "recovery-verified.img".
The recovery you have... Were you ever able to boot to it? If so, would you be willing to share a link to its download source, please?
I've got to run for a prior engagement, I'll check back later.
Thanks!

veronicadavis said:
I am too facing this problem. In case you got any solutions please let me know too.
Click to expand...
Click to collapse
I guess i find the reason why the modified recovery image won't boot.
I find an interesting information in a post of osm0sis (https://forum.xda-developers.com/showthread.php?t=2073775) were he say : "some newer MediaTek (MTK) devices use special image signing that adds a "BFBF" pre-header signature, so images will unpack/repack but most likely won't boot unless run through their internal signing tool."
After more search, i find an interesting publication (http://www.lieberbiber.de/2015/07/04/mediatek-details-partitions-and-preloader/) witch confirm that.
They say in conclusion of the publication :
"Yes, I can confirm that SignTool is able to add digital signature information to firmware images. Signed images have an additional header “BFBF” and some fluff which SP Flash Tool checks on a secure device. Apparently some manufacturers merely used the default MTK key for signing the images, making them no better off than a typical insecure MTK device."
So we have to find another way to install magisk to root it.

Root 9500/pro
Mine rooted already....you guys can check on 4pda russian forum
Note : do not use the 17.1 version of magisk there because after reboot the device will freeze if you resboot after twrp 1st install...instead flash 17.3+ or 18+ right after first install of twrp...
EDIT : dont mind the russian language in TWRP as you can change it to english once there

Yves596 said:
Hi everybody,
I try to root my Blackview BV9500 by installing first TWRP recovery. I use fastboot mode on a linux laptop to do that.
I successfully flash the twrp recovery image, but after that, the phone don't boot in recovery anymore.
It try to boot into recovery, but it reboot in normal mode a few second after.
I tried also with the cmd "fastboot boot recovery.img".
When i flash back the original recovery image, it work, i can boot the original recovery without any problem.
Does anyone have the problem?
Some one can help me to find a solution?
Click to expand...
Click to collapse
Hello I have same problem... Do you have that original recovery file? I don't have and I would like to get that back. Thanks.

DL this:
needrom. com/ download/bv9500pro- bv9500-root/ (delete spaces)
- Copy Magisk-v18.0.zip and disable_encryption_9500.zip to external SD-Card or OTG device
- backup your data from internal SD-Card
- do a factory reset and turn off phone without entering the setup guide after reboot, or wipe via recovery and power off
- Flash recovery.img using scatter.txt with SP Flash Tool
- boot into recovery with hold down vol + and power
- switch TWRP to your language and install Magisk-v18.0.zip and disable_encryption.zip
- reboot and update or install MagiskManager-v6.1.0.apk
Thanks to Jemmini from 4pda.ru

kanadali said:
DL this:
needrom. com/ download/bv9500pro- bv9500-root/ (delete spaces)
- Copy Magisk-v18.0.zip and disable_encryption_9500.zip to external SD-Card or OTG device
- backup your data from internal SD-Card
- do a factory reset and turn off phone without entering the setup guide after reboot, or wipe via recovery and power off
- Flash recovery.img using scatter.txt with SP Flash Tool
- boot into recovery with hold down vol + and power
- switch TWRP to your language and install Magisk-v18.0.zip and disable_encryption.zip
- reboot and update or install MagiskManager-v6.1.0.apk
Thanks to Jemmini from 4pda.ru
Click to expand...
Click to collapse
Thank you for your help and Jemmini help too, it work fine.
But on the firmware version 20180629.

Yves596 said:
Thank you for your help and Jemmini help too, it work fine.
But on the firmware version 20180629.
Click to expand...
Click to collapse
you can just download latest firmware and simply backup NVRAM etc with sp flash tool also flash with sp tool, you will have then working twrp with disabled encryption. there are tons of post regarding using sp flash tool on this forum
im using same phone and did these actions on first day and did not have any problem with twrp or magisk

Hi,
I've bought this phone in Pro version. I rooted my phone using needrom.com/download/bv9500pro-bv9500-root/ and adb after unlocking bootloader. Then I failed with errors. Then I used SPFlashTool in root mode with official 2018092919_s32v63c2k_jk_pro.rar rom (I don't find it anymore on the net but 1) I got it on Blackview official forum and 2) I have the file on my own PC) with format+Download and replace recovery with TWRP from Jemmini from 4pda.ru before flashing. OK.
Then I rooted again: format /data with TWRP, then install disable_encryption.zip, wipe dalvik, reboot on TWRP, then install Magisk, wipe dalvik, reboot normally.
Beware: TWRP is in Russian language at first boot, so to get it in English, first slide the first slide (allowing writing), then select 'Настройки', then the globe on top, then English, then 'Установитъ Язык'.
Hope this helps.
Then, this is my first rooted phone, so I plan to make a custom rom without Gapps (then maybe without Mediatek Ones and agold too) and remake all functionning with apps from Fdroid. Help needed on a manner of removing a system/vendor app properly. Help needed too to add V4A, as I could see max version supported is Nougat. I announce this here as my first post, but my project will be a full post. If someone want help please ask here or MP me
Note: an update of magisk is out (official 18.1), I installed it and my phone tells me a message that facial recognition was not working anymore then it only boots on TWRP... I reflashed it and my phone boots normally again. Wait and see...
Thanks to Jemmini from 4pda.ru again.
Bests Regards

nr0000000 said:
Hi,
I've bought this phone in Pro version. I rooted my phone using needrom.com/download/bv9500pro-bv9500-root/ and adb after unlocking bootloader. Then I failed with errors. Then I used SPFlashTool in root mode with official 2018092919_s32v63c2k_jk_pro.rar rom (I don't find it anymore on the net but 1) I got it on Blackview official forum and 2) I have the file on my own PC) with format+Download and replace recovery with TWRP from Jemmini from 4pda.ru before flashing. OK.
Then I rooted again: format /data with TWRP, then install disable_encryption.zip, wipe dalvik, reboot on TWRP, then install Magisk, wipe dalvik, reboot normally.
Beware: TWRP is in Russian language at first boot, so to get it in English, first slide the first slide (allowing writing), then select 'Настройки', then the globe on top, then English, then 'Установитъ Язык'.
Hope this helps.
Then, this is my first rooted phone, so I plan to make a custom rom without Gapps (then maybe without Mediatek Ones and agold too) and remake all functionning with apps from Fdroid. Help needed on a manner of removing a system/vendor app properly. Help needed too to add V4A, as I could see max version supported is Nougat. I announce this here as my first post, but my project will be a full post. If someone want help please ask here or MP me
Note: an update of magisk is out (official 18.1), I installed it and my phone tells me a message that facial recognition was not working anymore then it only boots on TWRP... I reflashed it and my phone boots normally again. Wait and see...
Thanks to Jemmini from 4pda.ru again.
Bests Regards
Click to expand...
Click to collapse
It'd be great to have another rom but I'm facing a problem with battery life. Basically mobile network standby drains 5000mah battery every day i turned off from developer option but still problem is there. I have checked every single post on Google but nobody has solution for this. U guys face this problem too?

kanadali said:
It'd be great to have another rom but I'm facing a problem with battery life. Basically mobile network standby drains 5000mah battery every day i turned off from developer option but still problem is there. I have checked every single post on Google but nobody has solution for this. U guys face this problem too?
Click to expand...
Click to collapse
New update has been released today. It solves some battery issues, but be very careful.
I installed it, having TWRP and now I'm stuck in TWRP. I've tried to wipe everything but I'm still in TWRP.
I'll try SPFlashTool ... hope it works.

Everything restored & updated.
Using SPFlashTool I flashed all files included in 2018092919_s32v63c2k_jk_pro.rar (including original recovery instead of TWRP).
After that, Android booted and then, using OTA, I updated to latest version.

Reflected_God said:
New update has been released today. It solves some battery issues, but be very careful.
I installed it, having TWRP and now I'm stuck in TWRP. I've tried to wipe everything but I'm still in TWRP.
I'll try SPFlashTool ... hope it works.
Click to expand...
Click to collapse
Could you please send me the link? Can't find it on blackview forum

kanadali said:
Could you please send me the link? Can't find it on blackview forum
Click to expand...
Click to collapse
The latest version is not on the forum. I installed via OTA.
But if you mean the previous firmware, there is one link on the blackview forum: http://bbs.blackview.hk/viewtopic.php?t=480235#p795494
SP Flash tools are well documented here: https://forum.xda-developers.com/showthread.php?t=1982587
And a complete list of blackview bv9500 / bv9500 pro files and instructions (in russian): https://4pda.ru/forum/index.php?showtopic=931296
Hope you find what you are looking for.

@kanadali,
for the moment I'm not facing battery drain because there is not simcard in it at this state of my modifications, sorry.
@Reflected_God,
I think this is the link I used, I use the 2018092919_s32v63c2k_jk_pro.rar rom for base.
For all others who faces big problems like me (facial recognition not working then reboot on twrp only, I could reflash my phone with SPFlashTool, the rom and twrp from Jemmini/4PDA in russian only (others don't work for me). I used Format + Download in root mode on Linux. Then format /data with TWRP, then install disable_encryption.zip, wipe dalvik, reboot on TWRP, then install Magisk, wipe dalvik, reboot normally. Do other things. To remove gapps I disabled/force stop it before remove with TWRP. Others apps I can't disable simply remove with TWRP. I test if I encounter bugs but none for the moment. If someone wants to know what I do I've made a LibreOffice Calc sheet log, which evolve when I have time
Hope this helps
Bests Regards

Need Files or a GOOD guide. bv9500 NOT PRO.
If someone could upload the exact files that they used, and the exact same steps, that would be great. Please mention what stock version you have and a link to the image if possible as well. I've followed numerous different guides, with multiple different rom versions, multiple different recovery imgs, used sp flash tool and adb/fastboot multiple times, tried making sure everything was unlocked before each try, have all the necessary drivers, and the closest I get to a functional twrp recovery is a green line that appears at the top of the boot screen before it reboots. Ive tried going to the source, the russian site, but all of the links are 404ed. if not for me, then it would be great to just have this all in one place. Thank you please future hero.
Please include exact program versions (ex SP Flash) as well if not zips of them. I am sorry to be asking so much in one post however I truly didn't know what else to do. And I am typically very good with my google fu xD
I currently have build number BV_BV9500_V1.0_20181026. That seems to matter I believe.

I second the notion.
I have the pro model. I have considered rooting it, but honestly, the phone works well enough as-is without root (for me). However, I'd LOVE to be able to play with different ROMs on this device **AS LONG AS I CAN MAINTAIN THE TWO-WAY UHF TRANSCEIVER FUNCTIONALITY** (i.e. not some "needs-a-network-of-some-kind" "walkie talkie app" like Zello but the real UHF two-way), and I'd LOVE the ability to play with the files associated with the radio to really explore the hardware's capabilities.
Unfortunately, this phone seems more popular in [North]eastern Asia than anywhere else so I don't think we're likely to get much on this forum regarding it unless and until BV become a popular name in the western hemisphere.