Develop Bugs

flashing twrp on lg g4 no error, but no twrp

I'm trying to flash twrp to my lg g4. I've reached the part where I run
Code:
fastboot flash recovery twrp.img
And everything seems to work fine, but when I try to enter recovery mode, I get the default lg recovery (restore factory mode options) and not twrp.
Here's what it prints out when I run the flash command:
Code:
target reported max download size of 536870912 bytes
sending 'recovery' (32060 KB)...
OKAY [ 0.827s]
writing 'recovery'...
OKAY [ 0.341s]
finished. total time: 1.168s
What am I doing wrong?
I tried doing it from a different computer and tried flashing older version of twrp.

No mate, you're not doing something wrong. You must overwrite the stock recovery, because it auto-flashes every time when phone starts. Best way is to use these commands :
adb reboot bootloader
fastboot boot recovery.img (rename recovery recovery.img , without .img (that's the extension, only "recovery", to make it clear)
I'm waiting the results....

Boot the image like. Azza_09 said then when TWRP has booted click on install then change to img instead of zip and select your twrp image. That should work, but Lg front end will be shown when booting to bootloader, simply answer both questions with yes then TWRP will load

LG G4: Installing SuperSU through TWRP renders device unbootable

FOR LG-H815, bought in Germany.
a) Went through the effort and unlocked the bootloader through LG's official method.
b) Confirmed, several times, that the bootloader is indeed unlocked.(via 'fastboot getvar unlocked' and verifying that the response is "unlocked: yes")
c) Tried to swap the Stock Recovery Mode with TWRP, using 'fastboot flash recovery twrp-2.8.6.0-h815.img'. The process ends in 1 sec. After booting in recovery mode, I find out it doesn't actually flash it.
d) Inside cmd: adb reboot bootloader
fastboot boot twrp-2.8.6.0-h815.img
At this point I am trying to boot TWRP for a one-time job of rooting the device.
-Install>>Select UPDATE-SuperSU-v2.46.zip>>Swipe to Install>> Reboot System
e) After reboot: PERMANENTLY STUCK, will not boot past LG's Logo. It is still possible to enter the Stock Recovery Mode, and Stock Download Mode.
I have repeated the process twice, reflashing the stock ROM, to the same effect. Any help is greatly appreciated.

You're flashing outdated versions of TWRP and SU...

I helped with this problem about 100 times now but I will do it one more time...
Firstly, reflash the stock MM ROM again.. Then download the better looking TWRP 3.0.2-0 from official twrp site -> https://dl.twrp.me/h815/twrp-3.0.2-0-h815.img.html
Now a little explanation. As far as I know in 6.0.X Google changed their policy a bit and the option to root the phone/ flash recovery is locked even though you have unlocked bootloader, and as well system root doesn't work, so instead of old SuperSU 2.46 you want to download newest systemless root zip -> http://forum.xda-developers.com/apps/supersu/2014-09-02-supersu-v2-05-t2868133 . Now, since there is no stock modified boot.img for G4, you have to download and unpack the custom kernel like SimpleGX and take it's boot img that you want to flash via fastboot, or you can try flashing boot.img from the Autoprime's V20D flashable zips, I didn't try that one and I will not be able to because my G4 got a bootloop issue that I recovered it of by my self but I cannot boot it up on Marshmallow stock firmware. Anyway once you flashed the modified boot img you should be able to flash recovery and boot it up normally, then flash systemless root and if you used boot.img from custom kernel, flash the full package because you did not flash all the stuff from the package what may cause software problems in the long term I suppose. I think that's all you need to do to root it on MM.

Adam Myczkowski said:
I think that's all you need to do to root it on MM.
Click to expand...
Click to collapse
And you would be correct. Although I have to wonder why guides on XDA don't even mention flashing a custom kernel like SimpleGX_KERNEL_H81520X_v1.3.2.zip
Additional steps for installing ROOT/TWRP on LG G4:
Inside CMD:
C:\adb>adb reboot bootloader
error: device '(null)' not found
C:\adb>adb devices
List of devices attached
LGH81539bf5a8e device
C:\adb>adb reboot bootloader
C:\adb>fastboot boot twrp-3.0.2-0-h815.img
downloading 'boot.img'...
OKAY [ 0.956s]
booting...
OKAY [ 0.028s]
finished. total time: 1.000s
Inside TWRP: Install>>Select SimpleGX_KERNEL_H81520X_v1.3.2.zip>>Swipe to the right>>Reboot // .zip file is ~19MB
Inside CMD:
C:\adb>adb reboot bootloader
C:\adb>fastboot flash recovery twrp-3.0.2-0-h815.img //now attempting to overwrite the stock recovery
target reported max download size of 536870912 bytes
sending 'recovery' (31652 KB)...
OKAY [ 0.969s]
writing 'recovery'...
OKAY [ 0.378s]
finished. total time: 1.365s
C:\adb>fastboot reboot
rebooting...
finished. total time: 0.002s
C:\adb>adb devices
List of devices attached
LGH81539bf5a8e device
C:\adb>adb reboot recovery //to verify that TWRP has been installed.
Inside TWRP:
Install>>Select BETA-SuperSU-v2.71-20160331103524.zip>>Swipe to the right>> Reboot
DONE.

Unable to flash any kernels since owning my Pixel XL

Alright guys I have never been able to flash any kernel on this phone at all. It always gets stuck on bouncing dots or sends me back to TWRP, Any suggestions? Here is how I flashed:
My steps to get TWRP + v4 Root + ElementalX v08 kernel all working together.
------------------
fastboot boot boot.img
Code:
C:\Users\xx\AppData\Local\Android\sdk1\platform-tools>fastboot boot boot.img
downloading 'boot.img'...
OKAY [ 0.673s]
booting...
OKAY [ 0.870s]
finished. total time: 1.543s
<phone automatically reboots to OS>
Booted phone to downloader mode.
Code:
C:\Users\xx\AppData\Local\Android\sdk1\platform-tools>fastboot boot twrp1.im
g
downloading 'boot.img'...
OKAY [ 0.640s]
booting...
OKAY [ 0.911s]
finished. total time: 1.551s
<phone automatically reboots to TWRP>
TWRP installed twrp zip.
Rebooted to TWRP.
TWRP installed v4 root.
Booted to OS
Verified root is working properly.
Booted phone to downloader mode.
fastboot flash kernel elementalx-0.08.zImage
Code:
C:\Users\xx\AppData\Local\Android\sdk1\platform-tools>fastboot flash kernel
elementalx-0.08.zImage
target reported max download size of 536870912 bytes
sending 'kernel' (19538 KB)...
OKAY [ 0.570s]
writing 'kernel'...
OKAY [ 0.600s]
finished. total time: 1.170s
fastboot reboot
Code:
C:\Users\xx\AppData\Local\Android\sdk1\platform-tools>fastboot reboot
rebooting...
finished. total time: 0.050s
Noticed root was not working.
Rebooted to TWRP
TWRP installed v4 root.
Rebooted back to OS.
Root + kernel + TWRP all installed and working fine.
Followed these instructions to a T and got everything working minus the kernel but when I flash any kernel I get pushed back to recovery? For some reason I have never been able install a kernel....... Any ideas I have not been able to flash a kernel since I got this phone. Any suggestions as to why or what I could try?

I believe its
Fastboot flash boot_b or boot_a boot.img look in fastboot mode which boot slot you have a or b

Unable to change recovery

Hi All.
Just bought a Wileyfox Swift. I'd like to install Lineage OS.
Reboot into bootloader, fastboot sees correctly my phone.
I run "fastboot oem unlock-go", my data gets wiped, then "fastboot reboot" and Android starts optimizing apps. Fine.
I go back into bootloader, now I try to flash TWRP:
Code:
# fastboot flash recovery twrp-3.0.3-0-crackling.img
target reported max download size of 268435456 bytes
sending 'recovery' (16908 KB)...
OKAY [ 0.532s]
writing 'recovery'...
OKAY [ 0.284s]
finished. total time: 0.816s
I reboot, Android starts correctly, power off. Go back into recovery but I still have the original Cyanogen recovery, no TWRP. What I'm doing wrong?
Thanks in advance for any hint!

If you are on the fastboot screen after flashing you should just select recovery and go there

There's no selection menu in fastboot mode on this phone. To go back into recovery I have to power off the device and power on again with volume-down + power button; but the recovery I got into isn't the TWRP I flashed but still the original cyanogenos recovery.

Pull battery after flashing recovery via fastboot. Then boot straight into recovery (not fastboot, not normal ROM), TWRP should be there.

Stuck in Fastboot Mode

Hi,
i was trying to installer lineageOS and was having some issues trying to install.
I read online to update TWRP since I was on a older version. I downloaded
twrp-3.2.3-0-flo.img 8.8M 2018-07-29 15:35:06 EDT and installed it via TWRP (old version)
rebooted and it does not load in to TWRP now and only takes me in to fastbook mode when i try to go in to recovery it takes me back to fastbook.
I also wiped out the OS since i was going to install LineageOS right after.
Any suggestions or help?
Thanks

dieselhomey said:
Hi,
i was trying to installer lineageOS and was having some issues trying to install.
I read online to update TWRP since I was on a older version. I downloaded
twrp-3.2.3-0-flo.img 8.8M 2018-07-29 15:35:06 EDT and installed it via TWRP (old version)
rebooted and it does not load in to TWRP now and only takes me in to fastbook mode when i try to go in to recovery it takes me back to fastbook.
I also wiped out the OS since i was going to install LineageOS right after.
Any suggestions or help?
Thanks
Click to expand...
Click to collapse
Hi, I just updated to twrp-3.2.3-0-flo.img via my old TWRP and see no problem. Here is a quick solution, in fastboot mode run: fastboot flash recovery twrp-3.2.3-0-flo.img
The latest fastboot app: https://www.xda-developers.com/google-releases-separate-adb-and-fastboot-binary-downloads/

just tried that with the latest fastbook app and a new .img downloaded twrp 3.2.3.-0 I get:
C:\>cd adb
C:\adb>cd platform-tools
C:\adb\platform-tools>fastboot flash recovery twrp-3.2.3-0-flo.img
< waiting for any device >
Sending 'recovery' (6 KB) OKAY [ 0.008s]
Writing 'recovery' FAILED (remote: image is not a boot image)
Finished. Total time: 0.033s
C:\adb\platform-tools>

sweet just downloaded it from a different computer and looks like i was able to update! cheers man