No bootloader? - G4 Q&A, Help & Troubleshooting

Good morning,
Having bought a phone LG G4 from China I doubt a bit of their ROM (we never know if they added cookies or what ..) So I decide to get started in the installation of a custom ROM. So already I notice that the phone is already rooted (while it was under blister). Well then I have to unlink the bootloader and I must restart in fastboot but nothing done I can not access the bootloader ?? I tried with the command window (adb reboot bootloader) but it restarts on the home screen .. ditto with an app boot manager, I go back every time on the home screen. How come? I do not have a bootloader or what ??
Thank you for clearing me up.
Sorry for my english

thetoan said:
Good morning,
Having bought a phone LG G4 from China I doubt a bit of their ROM (we never know if they added cookies or what ..) So I decide to get started in the installation of a custom ROM. So already I notice that the phone is already rooted (while it was under blister). Well then I have to unlink the bootloader and I must restart in fastboot but nothing done I can not access the bootloader ?? I tried with the command window (adb reboot bootloader) but it restarts on the home screen .. ditto with an app boot manager, I go back every time on the home screen. How come? I do not have a bootloader or what ??
Thank you for clearing me up.
Sorry for my english
Click to expand...
Click to collapse
not all LG G4 can be bootloader unlocked only some european and tmobile usa one.
if you had root maybe it was on lollipop phone is bootloader locked.. in lollipop only it can be rooted using system.img rooted. and injecting.. but if you update to MM with locked bootloader it cant be done. no root nothing..
also downgrading in somephones to lower android version bricks phones they have antirollback.. not sure it it applies to all g4. mine does it tmobile.. maybe other can be downgrade. see if yours can at lest to have it rooted..

raptorddd said:
not all LG G4 can be bootloader unlocked only some european and tmobile usa one.
if you had root maybe it was on lollipop phone is bootloader locked.. in lollipop only it can be rooted using system.img rooted. and injecting.. but if you update to MM with locked bootloader it cant be done. no root nothing..
also downgrading in somephones to lower android version bricks phones they have antirollback.. not sure it it applies to all g4. mine does it tmobile.. maybe other can be downgrade. see if yours can at lest to have it rooted..
Click to expand...
Click to collapse
I don't have the fastboot mode, so you think it's normal? Mine is on LP but I can't update to MM (the category update is missing in settings) wich I think is due to the seller chinese, he did some strange things on the phone I think.

thetoan said:
I don't have the fastboot mode, so you think it's normal? Mine is on LP but I can't update to MM (the category update is missing in settings) wich I think is due to the seller chinese, he did some strange things on the phone I think.
Click to expand...
Click to collapse
heres the list of the phones tha can be bootloader unlocked .. instal twrp and use custom roms and CM roms
https://forum.xda-developers.com/g4/general/unlock-list-lg-g4-variants-unlocked-t3262621
chinesse mmm maybe a fake phone.? if its on LP and has locked bootloader only root can be achieved. only on lollipop if you updat to marshmallow no root and sure as well still locked bootloader.

Related

Question about the bootloader, LGUP, LG Bridge and OTAs

Hello there!
I have a locked H815 and I've had many issues with it, especially when I upgraded to 6.0 and V20D. I've got it back from repairs and it's been downgraded to Android 5.1.
I saw that it's ok to use LGUP and flash 5.1 and 6.0 firmwares and that doesn't require an unlocked bootloader nor root.
Now, I want to ask if I unlock my bootloader, will I still be able to receive OTA updates? Or updates through LG Bridge?
Also, if I install a custom ROM right now, will I be able to successfully flash the stock firmwares and have the phone as it was just with an unlocked bootloader?
Thanks!
Peshyy said:
Hello there!
I have a locked H815 and I've had many issues with it, especially when I upgraded to 6.0 and V20D. I've got it back from repairs and it's been downgraded to Android 5.1.
I saw that it's ok to use LGUP and flash 5.1 and 6.0 firmwares and that doesn't require an unlocked bootloader nor root.
Now, I want to ask if I unlock my bootloader, will I still be able to receive OTA updates? Or updates through LG Bridge?
Also, if I install a custom ROM right now, will I be able to successfully flash the stock firmwares and have the phone as it was just with an unlocked bootloader?
Thanks!
Click to expand...
Click to collapse
i beleive so, but youll also loose warranty.
raptorddd said:
i beleive so, but youll also loose warranty.
Click to expand...
Click to collapse
Thanks! That's what I wanted to know.

G4 how to root it? (dont understand whats with bootloader and so)

Hello there, i got an LG G4 h815 few days ago, when ever i get new device first thing i do is root it, and it was always very easy for me.
with this g4 i got problems, try to go to LG website and unlock bootloader, it say i cant cause my device is h815 taiwan, so i read more in google and understand official unlock is only for the euro devices.
so i google more try to understand how can i unlock it unofficially, and found nothing, as well as try to google for a way to root it with out unlock bootloader, and also coulnt find.
im sure im missing something, cause i dont think its possible that there is no root for an old device, any help on how to root my phone?
thanks a head.
Lots of people here have H815 TWN...please can some one make a specific thread for rooting or installing xposed on Taiwanese H815 without the risking of bricking or bootlooping the device...meaning successful rooting ...
Sent from my LG-H815 using XDA-Developers mobile app
tiptip13 said:
Hello there, i got an LG G4 h815 few days ago, when ever i get new device first thing i do is root it, and it was always very easy for me.
with this g4 i got problems, try to go to LG website and unlock bootloader, it say i cant cause my device is h815 taiwan, so i read more in google and understand official unlock is only for the euro devices.
so i google more try to understand how can i unlock it unofficially, and found nothing, as well as try to google for a way to root it with out unlock bootloader, and also coulnt find.
im sure im missing something, cause i dont think its possible that there is no root for an old device, any help on how to root my phone?
thanks a head.
Click to expand...
Click to collapse
unfortunatelly you cant unlocked till today.. maybe later if someone can do it... but you can add root to locked bootloader... i have not tried this method.. i tried similar to h811 tmobile.. but its the same procedure.. mine is unlockacle but i dont want to with the bootloop issue... unlocking bootloader voids warranty. and root too but you can always try the kdz that disables the big cores and undo the root..
http://forum.xda-developers.com/g4/general/lg-g4-100-root-success-directives-root-t3180586
thank you, i found the root for locked bootloader, i done it, but its only for 5.1 android, and i still cant flash roms, only one rom witch they make for locked bootloader, so after all the process went back to unroot 6.0 androis >:
hope some1 will break this bootlock .

LG G4 Bootloop

Hello,
Today my Phone suddenly started to reboot at first it just did a reboot normaly but afterwards it started to reboot again but now I am stcuk in the screen with the lg logo and the bootloader unlocked message I tried to boot into recovery but after I choose to do factory reset so i can boot into twrp, again it only boots to the screen with lg logo and bootloader unlocked message.
I am on Genesys Rom and did not install any Mods
is there anyway for me to fix this?
Please help me
jizang said:
Hello,
Today my Phone suddenly started to reboot at first it just did a reboot normaly but afterwards it started to reboot again but now I am stcuk in the screen with the lg logo and the bootloader unlocked message I tried to boot into recovery but after I choose to do factory reset so i can boot into twrp, again it only boots to the screen with lg logo and bootloader unlocked message.
I am on Genesys Rom and did not install any Mods
is there anyway for me to fix this?
Please help me
Click to expand...
Click to collapse
unlocking the bootloade voids your warranty.. only way is to send it to LG... or used the modded KDZ to disable big cores... in case you ncaat fix it. or get new motherboard..
raptorddd said:
unlocking the bootloade voids your warranty.. only way is to send it to LG... or used the modded KDZ to disable big cores... in case you ncaat fix it. or get new motherboard..
Click to expand...
Click to collapse
So its not software related? Is there anyway to disable the bootloader unlocked message?
jizang said:
So its not software related? Is there anyway to disable the bootloader unlocked message?
Click to expand...
Click to collapse
bootloop not software but hardware... but you could try flashing KDZ using LGUP. ive seen some claim theirs worked after flashinf stock firmware if it continues then hardware but most likely its hardware..
mines is unlockable.. and trying to keep it that way for the same reason... ive seen a post that says it can be relocked...
heres is the post.. i would like to ask you a favor if you try it.. make video of it .. to prove it works..
http://forum.xda-developers.com/tmobile-g4/help/relock-bootloader-h811-t3372970
This is the reason why i swap my G4 H818P to Korean Variant G4. The Bootloop problem. Korean Variant is perfect for me. Strong 4G signal and no more SMS Limits in Marshmallow official update.
Sent from my LG-F500S using Tapatalk

Big cores enabled again after flashing a stock Lollipop to LG G4?

I ended up getting the infamous bootloop problem in my LG G4 around 2-3 months ago. I disabled the big cores to gain access into my files and salvaged them from the phone. I thought that I'd send the phone back to RMA under warranty, but ended up using the phone as my daily driver as it didn't slow the phone so much that I couldn't manage the sluggishness. That grew up on me on friday, as I went and got an OP3 to replace my G4 and have it finally repaired.
I flashed a stock 5.1 back to the phone, and after restarting the phone the bootloop issue reappeared. As I had disabled the big cores, and flashed the stock ROM to it, can I assume that:
1) the phone is now back to stock with all the files I had in it deleted?
2) big cores are again enabled because of the stock ROM?
3) no signs of rooting as flashing a stock ROM will unroot the device?
1-) yes
2-)yes
3-) if you havent unlocked the bootloader, you can do a wipe and make sure.
Levent2101 said:
1-) yes
2-)yes
3-) if you havent unlocked the bootloader, you can do a wipe and make sure.
Click to expand...
Click to collapse
If I remember correctly I did the rooting without unlocking the device and I used the stock V20d as ROM. But can't remember for 100% sure. How can I find out if it's locked or unlocked?
heartagramm said:
If I remember correctly I did the rooting without unlocking the device and I used the stock V20d as ROM. But can't remember for 100% sure. How can I find out if it's locked or unlocked?
Click to expand...
Click to collapse
Does your device say bootloader unlocked on the top left side of the screen as soon as you turn it on? If so you unlocked your bootloader.
Levent2101 said:
Does your device say bootloader unlocked on the top left side of the screen as soon as you turn it on? If so you unlocked your bootloader.
Click to expand...
Click to collapse
No, it doesn't so that means I haven't unlocked it. Thanks!

Cannot boot into bootloader/fastboot

Hello guys I have H815 and I can't proceed with unlocking bootloader cause my phone cannot boot into bootloader/fastboot mode. I'm not newbie, but with this phone everything goes ****ing different than in instruction.
I the instruction there is adb reboot bootloader. Of course my phone is seen in adb mode but after this command it just reboot to system. I tried also key combinations with no luck...
What to do?
My system is android 6
remialfa said:
Hello guys I have H815 and I can't proceed with unlocking bootloader cause my phone cannot boot into bootloader/fastboot mode. I'm not newbie, but with this phone everything goes ****ing different than in instruction.
I the instruction there is adb reboot bootloader. Of course my phone is seen in adb mode but after this command it just reboot to system. I tried also key combinations with no luck...
What to do?
My system is android 6
Click to expand...
Click to collapse
Hi,
I'm the same...
looking for solution I found this on Youtube:
Pratically, you have to press vol up while connect USB on PC....
I haven't the G4 with my today and so I cannot test if this is a valid mode...
If you do this, let me know if you can enter in fastboot mode
auceto63 said:
Hi,
I'm the same...
looking for solution I found this on Youtube:
Pratically, you have to press vol up while connect USB on PC....
I haven't the G4 with my today and so I cannot test if this is a valid mode...
If you do this, let me know if you can enter in fastboot mode
Click to expand...
Click to collapse
I did that and yeah it entered this mode but it's not valid bootloader/fastboot mode. It's some service mode to update firmware. Anyway it's not visible in pc as a normal fastboot and I cannot proceed further with unlocking bootloader...
Edit: it's download mode... So as I said it's not fastboot mode.
Anyone can help?
Seriously nobody? I thought this phone has good community and support...
I'm facing the exact same problem with my H810 on 6.0. Sick of not being able to root atleast.
Seriously hasn't anyone on earth found a way to boot this **** in fastboot? I mean there are a number of tutorials but everything goes different as F*** with this thing. Hope someone will update with good news. :fingers-crossed::fingers-crossed:
charith262 said:
I'm facing the exact same problem with my H810 on 6.0. Sick of not being able to root atleast.
Seriously hasn't anyone on earth found a way to boot this **** in fastboot? I mean there are a number of tutorials but everything goes different as F*** with this thing. Hope someone will update with good news. :fingers-crossed::fingers-crossed:
Click to expand...
Click to collapse
You can check out UsU. That is an unofficial bootloader unlock
ThePiGuy said:
You can check out UsU. That is an unofficial bootloader unlock
Click to expand...
Click to collapse
Thanks yeah I checked but that's for ARB<=2 devices. I forgot to mention earlier this godforsaken thing is ARB3.
I have an H811 (T-Mo) running firmware H81120p, ARB3. Doesn't seem to be much that can be done with it as far as rooting. It also has no stock recovery, only boots to system.
you did follow this official guide right? it unlocked mine after a few angry moments
http://developer.lge.com/resource/mobile/RetrieveBootloader.dev
use minimal ADB https://forum.xda-developers.com/showthread.php?t=2317790
Only way to boot twrp later is to use fastboot with ADB, recovery with buttons doesn't work.
if the device wont boot a rom use adb to get back in recovery.
if you use bank apps, install magisk before installing rom, do not get SU
samadee3 said:
you did follow this official guide right? it unlocked mine after a few angry moments
http://developer.lge.com/resource/mobile/RetrieveBootloader.dev
use minimal ADB https://forum.xda-developers.com/showthread.php?t=2317790
Only way to boot twrp later is to use fastboot with ADB, recovery with buttons doesn't work.
if the device wont boot a rom use adb to get back in recovery.
Click to expand...
Click to collapse
Only problem is that the info linked to above applies to ONE G4 variant only - the H815 international model. The rest of us are SOL. The bootloader on US carrier G4 - AT&T, T-Mo, VzW, etc (most later firmware revisions for G3 as well) models has been nailed down. The only exception is a G4 with ARB <= 2 can be hacked with UsU in order to root it and install a custom recovery.
SofaSpud said:
Only problem is that the info linked to above applies to ONE G4 variant only - the H815 international model. The rest of us are SOL. The bootloader on US carrier G4 - AT&T, T-Mo, VzW, etc (most later firmware revisions for G3 as well) models has been nailed down. The only exception is a G4 with ARB <= 2 can be hacked with UsU in order to root it and install a custom recovery.
Click to expand...
Click to collapse
Tmo is very easy
Go to dev options and enable adb
Then run "adb reboot bootloader"
Once there, run "fastboot oem unlock" and voila, you have an officially unlocked bootloader with no restrictions related to UsU
Please be aware the above will factory reset your device
ThePiGuy said:
Tmo is very easy
Go to dev options and enable adb
Then run "adb reboot bootloader"
Once there, run "fastboot oem unlock" and voila, you have an officially unlocked bootloader with no restrictions related to UsU
Please be aware the above will factory reset your device
Click to expand...
Click to collapse
Do you know anyone who has done it with H81120o or later? I've seen posts for two yrs about doing it that way, but I don't remember reading about it being done on 20o or later.
Sent from my SAMSUNG-SM-G935A using Tapatalk
SofaSpud said:
Do you know anyone who has done it with H81120o or later? I've seen posts for two yrs about doing it that way, but I don't remember reading about it being done on 20o or later.
Click to expand...
Click to collapse
Why v20o
Remember, this has nothing to do with UsU and therefore ARB etc doesn't matter
Edit: ps there are loads of H811 users in my Lineage thread and the other ROMs too
ThePiGuy said:
Why v20o
Remember, this has nothing to do with UsU and therefore ARB etc doesn't matter
Edit: ps there are loads of H811 users in my Lineage thread and the other ROMs too
Click to expand...
Click to collapse
Got it. Guess that it makes sense. ARB prevents rolling back to earlier release than 20o, I'm ok. Will try the BL unlock today then.
Sent from my SAMSUNG-SM-G935A using Tapatalk
I actually managed to get my LG V20 F800L into same situation after messing up my rooting process.
First i was stuck at logo and factory reset did nothing. Bootloader was working then.
Then i downloaded new firmware through "Download Mode", and after that i lost access to bootloader.
I know the phone model is different, but process seems to be very similar for all LG devices.
Trying to troubleshoot that atm, if i'll have results i'll post them here.
P.S. I know original poster long left (probably after throwing phone into a grinder), but maybe for someone with same problem as us in the future the info will be useful.
Florimer said:
I actually managed to get my LG V20 F800L into same situation after messing up my rooting process.
First i was stuck at logo and factory reset did nothing. Bootloader was working then.
Then i downloaded new firmware through "Download Mode", and after that i lost access to bootloader.
I know the phone model is different, but process seems to be very similar for all LG devices.
Trying to troubleshoot that atm, if i'll have results i'll post them here.
P.S. I know original poster long left (probably after throwing phone into a grinder), but maybe for someone with same problem as us in the future the info will be useful.
Click to expand...
Click to collapse
Ok, now i have to reply to my own post, since i believe i understand now something important:
LG phones usually dont have bootloader open to access. Until you use some exploits to do so.
I did not know that at the time of writing that reply.
Florimer said:
Ok, now i have to reply to my own post, since i believe i understand now something important:
LG phones usually dont have bootloader open to access. Until you use some exploits to do so.
I did not know that at the time of writing that reply.
Click to expand...
Click to collapse
Do you have more details about this? I seem to be in a similar situation than you and I'm struggling to make it work.

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