Unlocking bootloader on LG G4 H811 (T-Mobile)? - G4 Q&A, Help & Troubleshooting

I've got an LG G4 H811 (tmo) that I'm trying to install CyanogenMod on. (They list it as a supported device.) I successfully rooted it (Thanks, Team Codefire!), but "adb reboot bootloader" is just restarting the phone normally, and holding power & vol+ isn't working for me either. I'm running H81110h and I checked "Enable OEM unlock" in dev options. Does tmo have the bootloader locked down completely, or am I missing something?

Did you install TWRP? Whenever I get a new G4 (I'm on my 3rd one due to bootloop issue - this one was made in September, so hopefully I don't have anymore problems) I flash rooted image, and use that to install TWRP via Flashify or similar app. Once I have TWRP, I install whatever ROM I want.

Related

Possible no bootloader on h812?

I am on the canadian g4 stock firmware never updated , I have rooted it and installed xposed on it. I have also checked the box under developer options to allow bootloader unlocking even though it isn't unlockable yet.
I was reading through a bug report that my g4 automatically saved and it listed the bootloader as "unknown".
Also when I try "adb reboot bootloader" on pc, it just does a normal reboot same with "adb reboot fastboot"(This may be for unlocked bootloaders but I thought I would try it)
Is this because of either being rooted or having xposed installed? or did i corrupt my bootloader somehow?
EDIT: I can access stock recovery, as well as download mode and the imei thing with barcode.
Could be like the USA tmobile version that has no boot loader

Unable to access Recovery to unlock H815 after flashing TWRP from rooted phone

I think I now understand my mistakes, but I'd love to hear it if there's a way around this. I have the International version H815. My plan was to end up with a rooted version of Marshmallow. At the beginning of the day, I was not so clear about the difference between unlocking and rooting. I followed directions to install a rooted version of Lollipop. That went well. I flashed TWRP but couldn't figure out why that didn't work until I figured out that the bootloader should have been unlocked first. I then went through most of the steps to officially unlock the phone, but my phone just hangs at a fastboot intro screen using the abd reboot bootloader command, so I can't use the fastboot utility to recover the device ID I would need to get an unlock code. And I can't get into the original recovery menu using the power-volume down keys. I think I overwrote the stock Recovery utility when I flashed TWRP from within a rooted system. Switching back to a stock kdz didn't help. The phone still works fine otherwise, but now I see no path to unlocking it and then installing TWRP to load a rooted 6.0 image. Should I just give up now, or are there any other options?
Thanks,
Jim
Got it working
I reinstalled the rooted image and flashed a stock recovery.img. That didn't work. Then I went back to stock with a different kdz image. I still couldn't access the recovery tools with the power and volume down buttons, but I was a able to get fastboot functioning and got the unlock code from LG and entered it - now to see if I can go back to an unlocked system and install TWRP to upgrade to Marshmallow.

LG G Pad 8.0 F (v495) - Trouble Unlocking Bootloader

Has anyone successfully put a custom ROM on this device? I used to have an old Samsung S3 where I was able to put on CM and it was a piece of cake, but with this tablet I'm having issues with the bootloader being locked.
So far I've tried to install TWRP, CWM, and Philz custom recoveries. The problem seems to be with the versioning. Everything is customized for the v500. I was able to install Philz_Touch_recovery_V490.img which allowed me to boot into some sort of 'fastboot' recovery mode when before I would just get the message: "error boot certification verify" on start up. This fastboot mode isn't the Philz interface and it doesn't give me the option to back anything up or boot a ROM. It doesn't really give me any options except to restart, restart bootloader, or power off.
Were you on Lollipop or Marshmallow before you bricked it? (Which one?)
Lollipop.
The device is not bricked as I am still able to access the stock ROM. I just never was able to access my boot loader. I keep getting the error message "Error: boot certification verify" My carrier is US Cellular and they tend to lock a lot of features on their device. Is it possible they blocked boot loader access to be assholes?
BTW, my device is successfully rooted. (I checked with a root verify app.)
I'm looking into implementing the loki-master hack to unlock my boot loader and hopefully then Philz recovery will work as intended. (It is the only custom recover option that didn't give me an out-right failure message). This does seem to be an advanced developer tool requiring some code skills. Anybody have any tips for this Loki procedure?
BossRoyce said:
Lollipop.
The device is not bricked as I am still able to access the stock ROM. I just never was able to access my boot loader. I keep getting the error message "Error: boot certification verify" My carrier is US Cellular and they tend to lock a lot of features on their device. Is it possible they blocked boot loader access to be assholes?
BTW, my device is successfully rooted. (I checked with a root verify app.)
I'm looking into implementing the loki-master hack to unlock my boot loader and hopefully then Philz recovery will work as intended. (It is the only custom recover option that didn't give me an out-right failure message). This does seem to be an advanced developer tool requiring some code skills. Anybody have any tips for this Loki procedure?
Click to expand...
Click to collapse
I would doubt if you could still use the Loki method on a stock LG Lollipop ROM. For example, LG patched the Loki exploit on the VK810 LG G Pad 8.3 as of KitKat, and Lollipop on this device can't even boot the ROM using the old bootloader - it requires the Lollipop bootloader. In our case, the exploited bootloader can be temporarily reflashed to get into TWRP, but then we have to reflash the Lollipop bootloader to boot the ROM again.
sorry bring up old stuff
so i was able to root. have su i bcked up stock recovery and basicly any recover i flash i get the boot error but also gets fastboot.
ofcoarse ive tried most common commands and she wont reconize any of them.
im a long time lg user and thinking that this old of a sytem needs to be bumped like g3
att has always had a strictly locked bootloader state
Help oem unlock m8
I am currently trying to unlock bootloader on Lg gpad f 8.0 v495. At&t I follow all steps until enable oem unlock in developer options.. this option is missing in my developer options.. anyone know why or how to fix this or can I proceed without it. Help please.
BossRoyce said:
Has anyone successfully put a custom ROM on this device? I used to have an old Samsung S3 where I was able to put on CM and it was a piece of cake, but with this tablet I'm having issues with the bootloader being locked.
So far I've tried to install TWRP, CWM, and Philz custom recoveries. The problem seems to be with the versioning. Everything is customized for the v500. I was able to install Philz_Touch_recovery_V490.img which allowed me to boot into some sort of 'fastboot' recovery mode when before I would just get the message: "error boot certification verify" on start up. This fastboot mode isn't the Philz interface and it doesn't give me the option to back anything up or boot a ROM. It doesn't really give me any options except to restart, restart bootloader, or power off.
Click to expand...
Click to collapse
can you point me to the files you used to root the device.
THank you
Lg g pad f 8.0 v495
I rooted with kingroot apk but make sure you use kingroot version no higher than 4.5 . Because you are going to want to use SuperSume to replace kingroot as superuser it runs alot smoother. And for some reason any version higher than 4.5 of kingroot the supersume always freezez u. Hope this helps. If u get time pm have a question totally unrelated to the g pad but could use some help.

bullhead (nexus 5x) - Install OTA with only fastboot for locked device

Hey everyone,
My nexus 5x froze shutdown yesterday.
My phone uses TWRP and Cyanogenmod. After it happen I couldn't even boot into *recovery* ! The phone just "turns off" and I cannot turn it on for quite a while.
Eventually I was after to get into bootloader to use fastboot.
I tried to reflash the recovery. The flashing worked but I still couldn't boot into recovery.
I read somewhere someone who wrote that he/she locked and than unlocked the OEM lock and it worked for some reason, so STUPIDLY I locked my OEM, and when I try to unlock again it says I cannot unlock it (although I did enable OEM unlock in the first place, that's how I flashed in the first place).
SO HERE's the bottom line:
I am stuck with OEM lock enable and ONLY fastboot (cannot load into recovery).
I thought I installing OTA (which I can install with OEM lock), but I need ADB for that which I don't have.
ANY IDEAS????
THANKS A LOT IN ADVANCE GUYS!

'Enable OEM Unlock' not working?

Hi, I have a LG G4 H815 on Lollipop and I want to unlock it's bootloader to root it and flash an update and do other stuff. I want to try to unlock the bootloader the official way but whenever I go into the developer options and press the 'Enable OEM Unlock', it gives me a warning and I tap Ok but the slider still stays at the off position and it stays disabled
I really want to flash some stuff on it because some of the stock LG stuff is pretty crappy. Thanks in advance!
Try to soft reset your device and try after that
Zentom said:
Hi, I have a LG G4 H815 on Lollipop and I want to unlock it's bootloader to root it and flash an update and do other stuff. I want to try to unlock the bootloader the official way but whenever I go into the developer options and press the 'Enable OEM Unlock', it gives me a warning and I tap Ok but the slider still stays at the off position and it stays disabled
I really want to flash some stuff on it because some of the stock LG stuff is pretty crappy. Thanks in advance!
Click to expand...
Click to collapse
I don't have a slider. It's just a tick box. Try updating to the latest version first or reset your phone completely. All your files are wiped anyway when unlocking the bootloader so you have nothing to lose in trying these.
htr5 said:
I don't have a slider. It's just a tick box. Try updating to the latest version first or reset your phone completely. All your files are wiped anyway when unlocking the bootloader so you have nothing to lose in trying these.
Click to expand...
Click to collapse
I tried updating my phone to Marshmallow using the LG Flash tool with a kdz but the tool was having its own problems. It kept saying that it couldn't connect to server. I tried a lot of other methods to upgrade to Marshmallow but they didn't work. Do the flash tools need the bootloader to be unlocked too?
Zentom said:
I tried updating my phone to Marshmallow using the LG Flash tool with a kdz but the tool was having its own problems. It kept saying that it couldn't connect to server. I tried a lot of other methods to upgrade to Marshmallow but they didn't work. Do the flash tools need the bootloader to be unlocked too?
Click to expand...
Click to collapse
Without root or an unlocked bootloader, you can only use official root tools. I don't think your software version matters too much. Just do the full factory reset. There's no reason not to try doing this as bootloader unlocking does a factory reset itself.
I have also tried everything on my lg g4 on marshmallow...but can't turn on the oem unlock tick...
Any solutions
I tried factory reset too but still, not switching :'(
Sent from my QMobile A1 using XDA Labs
Hi same problem here, have you find a solution ?
Thanks
Tu4n3r said:
Hi same problem here, have you find a solution ?
Thanks
Click to expand...
Click to collapse
No, I didn't find a solution But I sold it anyway because the phone started to lag a lot in normal tasks
Sent from my QMobile A1 using XDA Labs
I got the same issue as yours here...and cannot even flash some Stock Rom on this "H815" model.....is your phone a refurbished model from Aliexpress? (as I suspect something here)
Dear all
After spending 3 days searching on the net, I found the way :
"Just purchased a LG G4 (H815). I'm in the process of unlocking the bootloader, and have been following LG's official instructions. However, I am having trouble performing step 8 of this guide:
"Enable OEM unlock on your phone. Activating the "Enable OEM unlock" is necessary for the bootloader unlock. To enable OEM unlock, go to Settings >> Developer options and check Enable OEM unlock."
Going into developer options and tapping on "Enable OEM unlock" returns the pop up message "WARNING: Device protection features will not work on this device while this setting is turned on. CANCEL ENABLE". After checking ENABLE, the pop up goes away, and I can see the checkmark box is checked for less than a second, and then it goes back to being unchecked on its own. Can anyone explain this?
Also, if instead of tapping CANCEL or ENABLE on the pop up, I click off of the pop up, the pop up goes away and the box will stay check marked until I interact with something else. Entering adb reboot bootloader from here though still does nothing sadly.
UPDATE: I had to download LG Bridge, connect my phone and use LG Bridge to search for a software update (H81520H) that my LG G4's update center was not finding for some reason. After the update, I had an update android security patch level, and could enable my OEM Unlock!"
Hi,
Thanks for the reply.
LG Bridge doesn't solve the thing for me, it says "Your phone is up to date" ... I installed and removed LG Bridge a few times and even tried to update it. And even tried the "Update error recovery" (blue text on the bottom right of the window), still with no success.
Still no access to Fastboot for me, even if Adb sees in device when prompting the command "adb devices".
This "H815 20o" software version I got (from stock rom, refurbished phone, with this insane locked bootloader) is driving me nuts for 3 days now...
Up,
If anybody ever got the same issue, any help is very welcome!
Problem solved with uSu and SALT
See this thread
https://forum.xda-developers.com/g4/general/unlock-unlock-lg-g4-device-usu-t3760451

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