[ROOT] HOWTO: AT&T H910 up to v20g (FULLY TESTED)

[LightSwitchTTM]

I'mma ask what version of windows? I did mine on 8.1.... did you run it as administrator?(usually anything firmware related everything should run as admin).... without the phone connected it should say waiting for device.... possibly do the command from inside the folder containing ADB; maybe you have another copy floating somewhere that has priority? ..... sidenote I believe I'm using what came with SkipSoft Unified Android Toolkit so might try installing that???

Here's some extra detail:
- Windows 10/Linux Mint 20
- Ran as admin
- It did say <waiting for device> when no device was connected
- All command lines were mapped to the root folder
- I'm not sure about another copy with priority, but after I rebooted both computers with nothing else running, I still got this issue
- For Windows i'm using the 15 second installer, which other people in this forum said worked to fix this problem, so I don't think that's the issue

I appreciate your help very much!

 

[plasmar]

Here's some extra detail:
- Windows 10/Linux Mint 20
- Ran as admin
- It did say <waiting for device> when no device was connected
- All command lines were mapped to the root folder
- I'm not sure about another copy with priority, but after I rebooted both computers with nothing else running, I still got this issue
- For Windows i'm using the 15 second installer, which other people in this forum said worked to fix this problem, so I don't think that's the issue

I appreciate your help very much!

does it do anything at all? like do you believe it's actually detecting the phone? can probably try "adb devices" see if the phone shows up...... also try putting stuff in a different directory; possibly the root of the host drive C:\(thinking you did)..... make sure no folders have any spaces in the names, sometimes that will mess things up with batch files/etc.... make sure debug mode is enabled/etc; try a diff usb cable(if it shows up in adb devices than it might be ok)

 

[LightSwitchTTM]

does it do anything at all? like do you believe it's actually detecting the phone? can probably try "adb devices" see if the phone shows up...... also try putting stuff in a different directory; possibly the root of the host drive C:\(thinking you did)..... make sure no folders have any spaces in the names, sometimes that will mess things up with batch files/etc.... make sure debug mode is enabled/etc; try a diff usb cable(if it shows up in adb devices than it might be ok)

- "adb devices" shows the device as online. I was able to install terminal emulator on it just fine.
- The "adb" files are in the root of the host drive (C:\adb)
- The folders don't have spaces in the names
- USB debugging and OEM unlock are enabled
- The USB cable is functional

Even if all of these are okay, I appreciate you going through the troubleshooting process with me. We will get to the root of the situation eventually!

 

[LightSwitchTTM]

Okay, so the previous issue was resolved. Installing adb from the 15-second installer was insufficient: I had to install it via Clockworkmod for the logcat command to function properly. I successfully installed TWRP version 3.0.2-1, as was included in the root_pkg, and then installed the H91010r ROM.

Now, I have a new "issue". I attempted to install the latest version of LineageOS with microG, and I was given TWRP error 7. Naturally, I attempted to install the newest TWRP version to try to remedy this issue. However, flashing it and rebooting into recovery either led to green error screen or back to fastboot. I re-executed STEP3.bat, and reverted back to version 3.0.2-1, which worked. I tried the latest US996 TWRP variant, as redoing STEP3.bat led to fastboot recognizing the device as the US996. Once again, green screen error. It seems that version 3.0.2-1 is the only one that works, and I'm not sure why that is.

I assume that it has something to do with the "boot" file referenced in STEP3.bat. I suspect that, with my little knowledge/experience, that there is some configuration with that file that is meant to work with the version included, but not anything else. If i knew more information about Android development I probably could remedy this issue myself, but alas, I do not. If anyone has any more information about this, I'd be happy to read

EDIT: Perhaps even, since it was the H915 KDZ that was flashed in the first step with LG UP, I need to use H915 software with the device?

 

[plasmar]

Okay, so the previous issue was resolved. Installing adb from the 15-second installer was insufficient: I had to install it via Clockworkmod for the logcat command to function properly. I successfully installed TWRP version 3.0.2-1, as was included in the root_pkg, and then installed the H91010r ROM.

Now, I have a new "issue". I attempted to install the latest version of LineageOS with microG, and I was given TWRP error 7. Naturally, I attempted to install the newest TWRP version to try to remedy this issue. However, flashing it and rebooting into recovery either led to green error screen or back to fastboot. I re-executed STEP3.bat, and reverted back to version 3.0.2-1, which worked. I tried the latest US996 TWRP variant, as redoing STEP3.bat led to fastboot recognizing the device as the US996. Once again, green screen error. It seems that version 3.0.2-1 is the only one that works, and I'm not sure why that is.

I assume that it has something to do with the "boot" file referenced in STEP3.bat. I suspect that, with my little knowledge/experience, that there is some configuration with that file that is meant to work with the version included, but not anything else. If i knew more information about Android development I probably could remedy this issue myself, but alas, I do not. If anyone has any more information about this, I'd be happy to read

EDIT: Perhaps even, since it was the H915 KDZ that was flashed in the first step with LG UP, I need to use H915 software with the device?

make sure you wipe prior to flashing whatever new rom(lineage or whatever)..... advance wipe and select everything but micro sd card, and usb otg..... than swipe factory reset.... format data... install the rom, reflash twrp through twrp to recovery prior to rebooting so that you don't lose twrp(most the roms replace it with either stock or other it seems)...... some roms take a long long time to boot the first time, or show up glitchy looking bootscreens or similar(apparently normal)... feel free to wipe Dalvik/ART Cache and cache at any point; it will delay booting a bit but may resolve some issues sometimes.... side note: depending on what version of lg v20 you have knowing if the bootloader is unlocked or not isn't the most apparently thing in the world; seems that the bootloader flashed is a dev bootloader that is unlocked by default vs where on h918 for instance I think people are actually unlocking the existing bootloader...... all in all the quirkiness of this thing I think causes a lot of confusion if you're coming from any other devices like myself(samsung, older sony and htc)

 

[LightSwitchTTM]

Update: TWRP was not able to work for me, but Lineage's recovery did! Now running Lineage v17.1 with Gapps

 

[MaverickNextDoor]

Hello, everyone.

Will following this root guide (and flashing a custom ROM like Lineage) unlock 3G and 4G?

I just got a H910 and can only utilize 2G (calls, sms, rudimentary data) as there are no options to select network type. Also, when I tapped on the network configuration sms automatically sent by my network on inserting the sim, a page popped up telling me I have 3 attempts to enter pin . I included a combined screenshot below. So I currently don't have 3G and 4G.

(Please, note I don't live in the US, so I'm not using an ATT sim).

Thanks.

 

[chicagonyc]

UPDATE: I needed to install LG's Mobile USB drivers first (instructions don't mention this!). Now it recognizes my phone and I'm currently dumping.

Hello everyone,

The software version is H91020h. When the phone boots it shows an unlocked icon. I want to install LineageOS 17.1

I downloaded the files in the first post, but I am getting stuck on installing LGUP. I unzipped and put it into the proper folder, but when I click on LGUP (there was no "installer"), it tells me I am missing a LG USB driver installation. I tried starting as Administrator and that didn't help.

Any ideas?

View attachment 5184199

 

[chicagonyc]

The v20-root.zip file has a Trojan ( "Trojan:Win32/Sehyioa.A!cl" according to Windows Defender). Did you get that?

I just used this guide to unlock my H910 running 20h. The hardest part was finding a windows machine to run LGUP on. I'm all linux these days.

The links to the dirtysanta root package and the v10r image seem to be broken. I used the root package from this thread.

After unlocking the bootloader and installing TWRP I flashed Lineageos 17.1 which seems to be working well.

Thanks!

 

[chicagonyc]

The link to the DirtySanta root package appears to be down. Does anyone have an alternative?

 

[MaverickNextDoor]

The link to the DirtySanta root package appears to be down. Does anyone have an alternative?

Just search for "h910_root_pkg.zip (androidfilehost)" on Google. The zip contains Dirty Santa files.

 

[plasmar]

h910_root_pkg

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www.mediafire.com

** uploaded it cause half the time when I'm trying to root/mod an old phone half the files are missing or no longer available cause no one cared to re-upload....... bought another H910 in near mint condition, rooted it fine, had great signal and today "No Service"; can't win can I...... worse case I'll swap the board but going to try to flash back the whole phone using the original dump; I am a bit confused though

 

[chicagonyc]

Ok I got almost all the way, but I think I bricked my phone. The 1st command prompt window seemed frozen where I would enter STEP2.BAT, so I opened a 3rd command prompt window and proceeded there (stupid, I know). Everything appeared to work, and FASTBOOT came up on the phone and everything. Rebooting, though, put this on the screen.

And then this crash screen:

Anything to do to save the phone?

 

[clsA]

Ok I got almost all the way, but I think I bricked my phone. The 1st command prompt window seemed frozen where I would enter STEP2.BAT, so I opened a 3rd command prompt window and proceeded there (stupid, I know). Everything appeared to work, and FASTBOOT came up on the phone and everything. Rebooting, though, put this on the screen.

View attachment 5186687

And then this crash screen:

View attachment 5186685

Anything to do to save the phone?

The static screen is normal if you did'nt flash the kernel
just turn the screen off and back on and it fixes it.

the crash dump is also normal, you can't just do half the steps do the complete process and all will be ok