Has anyone successfully rooted 10d with the tot method? My phone always fails to boot. I get a red boot method saying boot verification failed. I've followed the instructions exactly on the guide posted in the dev section. If anyone has any ideas, let me know. Thanks.
You might of forgotten to unlock boot loader first? Or forgot to check off USB Debugging? I had a similar problem. I solved it by using LGUP to flash stock tot. Then I retraced my steps and start all over again. Step by step.
Yes u need to fastboot oem unlock
Your bootloader before hand or it will fail
Sent from AOSP Developer Cfox88
I'm having the same issue. I was able to flash the kdz after a lot of headache and reinstalls. That reset my phone as it was supposed to. I then unlocked my bootloader again and tried flashing the tot but no, it fails every time. My computer just broke down too so I'm completely stuck in limbo now.
Sent from my LG-H830 using XDA-Developers mobile app
I could be mistaken, but I think once you upgrade to 10D without following @autoprime instructions you're stuck.
Related
6.0 Marshmallow with insecure modded kernel and TWRP recovery
This needs testing by someone else. It has been flashed on my own personal phone with no issues.
Requirements- Unlocked bootloader, Draken FX's Bootstack -the fixed version by Turbo2012 found in DrakenFX's thread for the flashable 6.0 update. Must be currently on an LG based ROM NOT CM. After install flash SuperSU install zip, post any issues. You will be able to ADB and Fastboot even if you can only boot splash screen with this kernel so you should be able to recover from almost anything multiple ways. When time allows I will put up a source built 6.0 along the lines of Game Theory's Katana ROM. Everybody is welcome to everything I post and I strongly encourage the young crowd to get involved, these phones don't support their selves.
Downloads:
Tested SuperSU
Working Bootstack for 6.0 MM
Update.zip
Instructions:
Flash Bootstack
Flash Update
Flash Beta SuperSU from link
New debloated version with insecure kernel and init.d support, rooted with Chainfire's Beta 2.71 SuperSU credit to SuperR for the help with the updater perms.
FIXED DOWNLOAD ALL APOLOGIES
Skinny Stylo Alpha version
Credits:
DrakenFX for his flashable zips and kdz files
Turbo2012 fixing and contributing
Chainfire for his SuperSU and he's been here since it started
Saved
Requirements- Unlocked bootloader
Click to expand...
Click to collapse
Does that mean a fastboot oem unlock, or the OEM unlock in the developers tools. If you mean fastboot oem unlock, is that available once you flash stock MM, since it is not in LP?
PS - thank you very much for taking the time to pick this up. Back in the days of the Galaxy S1, I had a build environment setup, and a lot more knowledge (it is amazing that if you don't use it, you lose it), but I have a son now, so I don't have the time to invest in all the hobbies that I want anymore. I will definitely be a guinea pig for you. I am not actually aware of a way to brick the Metro or TMO versions of this phone since we have a kdz -- it is not possible to blow up firmware download mode.
runningnak3d said:
Does that mean a fastboot oem unlock, or the OEM unlock in the developers tools. If you mean fastboot oem unlock, is that available once you flash stock MM, since it is not in LP?
PS - thank you very much for taking the time to pick this up. Back in the days of the Galaxy S1, I had a build environment setup, and a lot more knowledge (it is amazing that if you don't use it, you lose it), but I have a son now, so I don't have the time to invest in all the hobbies that I want anymore. I will definitely be a guinea pig for you. I am not actually aware of a way to brick the Metro or TMO versions of this phone since we have a kdz -- it is not possible to blow up firmware download mode.
Click to expand...
Click to collapse
@runningnak3d
I would prefer to be bootloader unlocked through fastboot oem unlock before doing any mods in 6.0. Every single time I did not I got secure boot error. If you make any system change on 6.0 with locked boot it will not boot.
Thank you for taking the time to do this.
:good::good:
So it's still not possible to update from Lollipop to rooted Marshmallow without unlocking the bootloader via fastboot? A secure boot error might as well be a brick to me. Oh well.
Revenant Ghost said:
So it's still not possible to update from Lollipop to rooted Marshmallow without unlocking the bootloader via fastboot? A secure boot error might as well be a brick to me. Oh well.
Click to expand...
Click to collapse
The main reason I made this was because I can never boot recovery or fastboot manually ( ex. w/hardware buttons) when you have the insecure kernel adb works when at the splash screen so it's easier to recover if you have any problems.
Sent from my LG-H631 using XDA-Developers mobile app
Revenant Ghost said:
So it's still not possible to update from Lollipop to rooted Marshmallow without unlocking the bootloader via fastboot? A secure boot error might as well be a brick to me. Oh well.
Click to expand...
Click to collapse
If you used Draken's guide to root and install TWRP on lollipop, your bootloader will be unlocked.
wrenchman76 said:
If you used Draken's guide to root and install TWRP on lollipop, your bootloader will be unlocked.
Click to expand...
Click to collapse
You only need a "soft" unlock (enable oem unlock in developer mode) to root / install TWRP on lolipop -- no PC required. MM however, requires a "hard" OEM unlock, and that requires a PC.
runningnak3d said:
You only need a "soft" unlock (enable oem unlock in developer mode) to root / install TWRP on lolipop -- no PC required. MM however, requires a "hard" OEM unlock, and that requires a PC.
Click to expand...
Click to collapse
I am currently on lollipop rooted and TWRP installed off of Draken's guide. Do I need to do something else to the bootloader before I flash this ROM?
wrenchman76 said:
I am currently on lollipop rooted and TWRP installed off of Draken's guide. Do I need to do something else to the bootloader before I flash this ROM?
Click to expand...
Click to collapse
Yes, you have to unlock your bootloader with fastboot oem unlock. If you flash this without unlocking your bootloader you will get a secure boot error, and you will have to flash a KDZ and start all over.
Lolipop doesn't come with fastboot. So you have to follow Draken's thread to get stock MM on your device. There is NO other way. Once you have stock MM you can unlock your boot loader with fastboot. Once you have an unlocked boot loader -- THEN you can flash this if you want.
Waiting on the debloated version.
Sent from my LGMS631 using Tapatalk
runningnak3d said:
Yes, you have to unlock your bootloader with fastboot oem unlock. If you flash this without unlocking your bootloader you will get a secure boot error, and you will have to flash a KDZ and start all over.
Lolipop doesn't come with fastboot. So you have to follow Draken's thread to get stock MM on your device. There is NO other way. Once you have stock MM you can unlock your boot loader with fastboot. Once you have an unlocked boot loader -- THEN you can flash this if you want.
Click to expand...
Click to collapse
I can vouch for this. That's exactly what happened to me when I tried to flash this without unlocking the bootloader with fastboot. At least I finally managed to ship my device to LG for repairs today. I'll just chalk it up as another lesson learned.
Revenant Ghost said:
I can vouch for this. That's exactly what happened to me when I tried to flash this without unlocking the bootloader with fastboot. At least I finally managed to ship my device to LG for repairs today. I'll just chalk it up as another lesson learned.
Click to expand...
Click to collapse
You didn't need to ship it back to LG. Firmware download mode is always available (hold vol up while plugging in USB cable -- just vol up, not vol up + power). Continue holding vol up until FW DL mode displays). Then just use the LG flash tool to flash a KDZ. It is a PITA when you have to go back that far, but you can't brick these phones, not with software at least -- they would need to be physically altered
-- Brian
Revenant Ghost said:
I can vouch for this. That's exactly what happened to me when I tried to flash this without unlocking the bootloader with fastboot. At least I finally managed to ship my device to LG for repairs today. I'll just chalk it up as another lesson learned.
Click to expand...
Click to collapse
You sent your device in for a soft brick? You should set up the flash tool for our phone with a 10j.kdz before doing anything. Hope you get it back soon.
Debloated version
Fixing some force close problems on a debloated version now, should be up later today or tonight.
@runningnak3d
Flashing the KDZ seems easy enough. But how could I fix it without unrestricted access to a computer? And my stock charger is broken without a USB cable. I had no choice but to send it in for repairs. Guess I'll be stuck on Lollipop for a while longer, at least.
Edubyah said:
6.0 Marshmallow with insecure modded kernel and TWRP recovery
This needs testing by someone else. It has been flashed on my own personal phone with no issues.
Requirements- Unlocked bootloader, Draken FX's Bootstack -the fixed version by Turbo2012 found in DrakenFX's thread for the flashable 6.0 update. Must be currently on an LG based ROM NOT CM. After install flash SuperSU install zip, post any issues. You will be able to ADB and Fastboot even if you can only boot splash screen with this kernel so you should be able to recover from almost anything multiple ways. When time allows I will put up a source built 6.0 along the lines of Game Theory's Katana ROM. Everybody is welcome to everything I post and I strongly encourage the young crowd to get involved, these phones don't support their selves.
Downloads:
Tested SuperSU
Working Bootstack for 6.0 MM
Update.zip
Instructions:
Flash Bootstack
Flash Update
Flash Beta SuperSU from link
Credits:
DrakenFX for his flashable zips and kdz files
Turbo2012 fixing and contributing
Chainfire for his SuperSU and he's been here since it started
Click to expand...
Click to collapse
Can you post links to DrakenFx post and will this work with CDMA version (ie, Boost Mobile 770 version of hardware)
JBoever said:
Can you post links to DrakenFx post and will this work with CDMA version (ie, Boost Mobile 770 version of hardware)
Click to expand...
Click to collapse
Can the bootloader be unlocked on the CDMA versions (ex. Boost, Sprint, Verizon)? If you can I will make a variant for it. But if you can't NO.
I just found out that the unlocked bootloader in 6.0 survives even the .kdz flashtool. So once you unlock your boot in 6.0 with fastboot oem unlock you never have to do it again even survived kdz downgrade to lollipop and update to 6.0 stayed unlocked.
JBoever said:
Can you post links to DrakenFx post and will this work with CDMA version (ie, Boost Mobile 770 version of hardware)
Click to expand...
Click to collapse
works great on metro ms631 just need wifi to stop turning its self off can you guys fix it! h631/ms631 mm kernel works find no errors help needed fixing wifi connection thanks
So yes I can't remember if I had unlocked it or not. Right now I am stuck in bootloop with red small txt i can't even read. Guessing its boot failure. I tried doing what ppl have said by downloading a full tot but LGup keeps telling me anti rollback ver is smaller than the device version. I am stuck and need help plz.
Im in the same boat as you bro
Any luck?
Same thing happened to me.
You have to unlock the bootloader before flashing the tot file.
I rolled back to orig firmware using kdz file from lg, unlocked bootloader then followed rooting instructions.
All rooted now.
thelee said:
Same thing happened to me.
You have to unlock the bootloader before flashing the tot file.
I rolled back to orig firmware using kdz file from lg, unlocked bootloader then followed rooting instructions.
All rooted now.
Click to expand...
Click to collapse
Thank you so much!
So I followed the instructions EXACTLY as said.
All went well until I had to boot into TWRP, from there I was bootlooping and getting the "Boot Verification Error...MISMATCH_SIG_LEN"
I followed another set of instructions to follow the same steps but instead flash the stock tot.
So I did that, but about 5 seconds after pressing "start" I get some antirollback error (posted image below)
Ive tried flasing via the upgrade option, as well as the refurbish option
Ive done a ton of searching and I found noooo solution
Please help :crying: :crying:
[UPDATE]
Alright guys, so I started getting frustrated and adventurous lol, and after a good amount of digging I found a solution.
So the antirollback is basically just a feature preventing downgrades from what Ive gathered, meaning you cant flash the stock TOT file that a couple people suggested (THIS IS IF YOU'RE ON 10D BTW AND TRIED TO USE THE ROOT METHOD) because its a 10a software.
So I decided to search for a 10d stock tot file (with no avail) BUT i came across a 10d stock kdz file, which absolutely got the job done.
So just download the kdz file and flash it using lgup
Link to the the kdz file: here
I tried to make this as thorough as possible for noobs like me lol
So recently I wanted to flash 20a via twrp on my G5 but it wasn't working. I reflashed 10i and my phone didn't want to boot up. So I decided to charge my phone after reflashing 10i once again without flashing supersu and I powered off the device and it turned back on with the "Your device is corrupt and it cannot be trusted sign" and so I tried to boot to recovery and my phone just factory reseted itself. I tried to boot into recovery with adb but to no avail. I even tried to flash 10d kdz and 10d tot both getting an error on LGUP and my phone is still stuck on firmware 10i. I even get an error when trying to update it with stock recovery. So now I have a phone with an unlocked boot loader and I cannot reroot again. Is there a way I can regain root? I knew I should have flashed supersu
RicardoSal24 said:
So recently I wanted to flash 20a via twrp on my G5 but it wasn't working. I reflashed 10i and my phone didn't want to boot up. So I decided to charge my phone after reflashing 10i once again without flashing supersu and I powered off the device and it turned back on with the "Your device is corrupt and it cannot be trusted sign" and so I tried to boot to recovery and my phone just factory reseted itself. I tried to boot into recovery with adb but to no avail. I even tried to flash 10d kdz and 10d tot both getting an error on LGUP and my phone is still stuck on firmware 10i. I even get an error when trying to update it with stock recovery. So now I have a phone with an unlocked boot loader and I cannot reroot again. Is there a way I can regain root? I knew I should have flashed supersu
Click to expand...
Click to collapse
I bet you didn't followed or read the 20a thread by autoprime nor did you bothered to read the TWRP thread as well. there's still a bug that prohibits you to downgrade from 20a unless you have a nandroid backup or a twrp recovery backup for the 10i. best option for now is to go back to 20a and wait for an update from the devs on fixing TWRP or try to follow the dirtycow method.
Jaistah said:
I bet you didn't followed or read the 20a thread by autoprime nor did you bothered to read the TWRP thread as well. there's still a bug that prohibits you to downgrade from 20a unless you have a nandroid backup or a twrp recovery backup for the 10i. best option for now is to go back to 20a and wait for an update from the devs on fixing TWRP or try to follow the dirtycow method.
Click to expand...
Click to collapse
The problem was that for some reason I couldn't update it but please pass the link to dirtycows :good:
RicardoSal24 said:
The problem was that for some reason I couldn't update it but please pass the link to dirtycows :good:
Click to expand...
Click to collapse
Look under the dev thread on autoprime topic about the stock N zips, if you read through last few pages you'll find all the links you need for recowvery to get root and twrp. Also if you're on 10i, why not just use lg up (make sure you either use older version or autoprime uppercut app) to flash 10D tot that already has twrp and then upgrade to stock 7 through twrp. Either way, all the info you need should be in last 3 pages of that thread by autoprime.
*** Edit ***
Just reread your post. If your getting errors flashing the 10D tot it's most likely due to you updating lg up, the .DLL, etc to install N. If so, uninstall lg up, and then download the lg up files and. DLL from the 10D thread. You can try uppercut app too as it's supposed to work between versions but I have not tested it myself. If all else fails then use the recowvery method.
jeffsga88 said:
Look under the dev thread on autoprime topic about the stock N zips, if you read through last few pages you'll find all the links you need for recowvery to get root and twrp. Also if you're on 10i, why not just use lg up (make sure you either use older version or autoprime uppercut app) to flash 10D tot that already has twrp and then upgrade to stock 7 through twrp. Either way, all the info you need should be in last 3 pages of that thread by autoprime.
*** Edit ***
Just reread your post. If your getting errors flashing the 10D tot it's most likely due to you updating lg up, the .DLL, etc to install N. If so, uninstall lg up, and then download the lg up files and. DLL from the 10D thread. You can try uppercut app too as it's supposed to work between versions but I have not tested it myself. If all else fails then use the recowvery method.
Click to expand...
Click to collapse
I've tried uppercut and I still get errors. I want to downgrade using the kdz file but the link is broken for me. Though I will try an older version of lgup. Thanks :good:
RicardoSal24 said:
I've tried uppercut and I still get errors. I want to downgrade using the kdz file but the link is broken for me. Though I will try an older version of lgup. Thanks :good:
Click to expand...
Click to collapse
Yeah not sure about uppercut. If you're still on 10i you should be fine using lgup to downgrade as long as you use the right version of lgup and h830 .DLL file. Also I'm not sure you can use refurbish option with kdz, but I know you can with tot. So maybe downgrade to 10D using tot and upgrade through twrp. If all else fails, use the recowvery steps on the above linked thread and you should be all good. Quick question, when you first start your phone, does it just show phone can not be checked for corruption or does it show the message can't be checked for corruption and visit this site... Etc. ? Reason I ask is the second message is updated bootloader and you won't be able to use lg up to flash MM firmware until you downgrade your bootloader.
jeffsga88 said:
Yeah not sure about uppercut. If you're still on 10i you should be fine using lgup to downgrade as long as you use the right version of lgup and h830 .DLL file. Also I'm not sure you can use refurbish option with kdz, but I know you can with tot. So maybe downgrade to 10D using tot and upgrade through twrp. If all else fails, use the recowvery steps on the above linked thread and you should be all good. Quick question, when you first start your phone, does it just show phone can not be checked for corruption or does it show the message can't be checked for corruption and visit this site... Etc. ? Reason I ask is the second message is updated bootloader and you won't be able to use lg up to flash MM firmware until you downgrade your bootloader.
Click to expand...
Click to collapse
Updated bootloader? I had no idea that was a problem. But since I'm on 20a i get the corruption message plus the link so O guess my bootloader is upgraded. How exactly DO you downgrade the bootloader?
I will mention that I'm stuck without twrp
RicardoSal24 said:
Updated bootloader? I had no idea that was a problem. But since I'm on 20a i get the corruption message plus the link so O guess my bootloader is upgraded. How exactly DO you downgrade the bootloader?
I will mention that I'm stuck without twrp
Click to expand...
Click to collapse
Okay since you have an upgraded bootloader and no twrp you will have to follow the steps in that post for recowvery which will give you Root and twrp. Once you have twrp, download the bootloader zip for whichever version you're planning on downgrading to (I.e. 10I bootloader if flashing 10i kdz) from autoprime and flash in twrp. You can also flash the complete zip (i.e. 10I complete zip) in twrp after flashing the 10I bootloader if you want to keep root and twrp (you will also have to flash SuperSU after flashing those files). But you can also flash kdz or tot with lg up after downgrading bootloader via twrp but you will lose root and twrp unless you flash 10D rooted tot.
jeffsga88 said:
Okay since you have an upgraded bootloader and no twrp you will have to follow the steps in that post for recowvery which will give you Root and twrp. Once you have twrp, download the bootloader zip for whichever version you're planning on downgrading to (I.e. 10I bootloader if flashing 10i kdz) from autoprime and flash in twrp. You can also flash the complete zip (i.e. 10I complete zip) in twrp after flashing the 10I bootloader if you want to keep root and twrp (you will also have to flash SuperSU after flashing those files). But you can also flash kdz or tot with lg up after downgrading bootloader via twrp but you will lose root and twrp unless you flash 10D rooted tot.
Click to expand...
Click to collapse
Can you please give the link to the thread you're talking about?
RicardoSal24 said:
Can you please give the link to the thread you're talking about?
Click to expand...
Click to collapse
The thread is:
http://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-20a-rom-flashable-zips-imgs-t3511294
If you're just trying to get twrp and root to downgrade look at the last 5 or so pages and look for the recowvery post. Once you do that visit:
http://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-10j-rom-flashable-zips-imgs-t3491363
and download the bootloader zip and then boot into twrp and flash the bootloader zip. Then you can use lg up to flash kdz file or tot file. If you want to do everything from twrp and skip lg up step just download the complete zip from the 10J thread and flash in twrp after flashing bootloader, then if you want to keep twrp and root make sure after flashing bootloader and complete zip in twrp flash SuperSU before rebooting.
jeffsga88 said:
The thread is:
http://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-20a-rom-flashable-zips-imgs-t3511294
If you're just trying to get twrp and root to downgrade look at the last 5 or so pages and look for the recowvery post. Once you do that visit:
http://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-10j-rom-flashable-zips-imgs-t3491363
and download the bootloader zip and then boot into twrp and flash the bootloader zip. Then you can use lg up to flash kdz file or tot file. If you want to do everything from twrp and skip lg up step just download the complete zip from the 10J thread and flash in twrp after flashing bootloader, then if you want to keep twrp and root make sure after flashing bootloader and complete zip in twrp flash SuperSU before rebooting.
Click to expand...
Click to collapse
Is there a video using the g5? I found only one and thats with the v20 and the guy in the video doesn't have much of a close up to his laptop
RicardoSal24 said:
Is there a video using the g5? I found only one and thats with the v20 and the guy in the video doesn't have much of a close up to his laptop
Click to expand...
Click to collapse
I don't think so but not 100% sure. If you follow the steps carefully you'll be fine. I didn't directly post the recowvery steps as I have not used this (I've had twrp and root since 10D). You can look on the v20 thread as it has a post for the v20 and our h830 recowvery method. Sorry I can't be more help with that specifically.
jeffsga88 said:
I don't think so but not 100% sure. If you follow the steps carefully you'll be fine. I didn't directly post the recowvery steps as I have not used this (I've had twrp and root since 10D). You can look on the v20 thread as it has a post for the v20 and our h830 recowvery method. Sorry I can't be more help with that specifically.
Click to expand...
Click to collapse
You were helpful enough :good:
So I've been doing a little bit of research, trying to figure out how to root my phone. I read I needed to downgrade my Security patch to something lower than 20i. I can probably figure out how to root it if I had a guide to downgrade my phone. Anyway I thought I'd ask this amazing community for some help! Thanks guys!
tuff3r said:
So I've been doing a little bit of research, trying to figure out how to root my phone. I read I needed to downgrade my Security patch to something lower than 20i. I can probably figure out how to root it if I had a guide to downgrade my phone. Anyway I thought I'd ask this amazing community for some help! Thanks guys!
Click to expand...
Click to collapse
Just follow the steps to flash 20a in that thread with LGUP. No other steps required. Just do a factory reset then flash 20a then root. If your phone is buggy after flashing 20a do another factory reset then root. After rooting you can follow the guide to flash 20i using TWRP.
Sent from my LG-H830 using Tapatalk
Sdobron said:
Just follow the steps to flash 20a in that thread with LGUP. No other steps required. Just do a factory reset then flash 20a then root. If your phone is buggy after flashing 20a do another factory reset then root. After rooting you can follow the guide to flash 20i using TWRP.
Sent from my LG-H830 using Tapatalk
Click to expand...
Click to collapse
Could you link what is the better steps to follow
I already try downgrade flash 20a with LGUP, without success.
eekthecat said:
Could you link what is the better steps to follow
I already try downgrade flash 20a with LGUP, without success.
Click to expand...
Click to collapse
Here is link for downgrading using LGUP
https://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-20a-rom-flashable-zips-imgs-t3511294
Here is alternative method for downgrading using lg Flashtool
https://forum.xda-developers.com/lg-g5/how-to/bring-lg-g5-to-life-download-mode-lgup-t3565508
Here is link for rooting
https://forum.xda-developers.com/tmobile-lg-g5/how-to/guide-root-twrp-lg-g5-using-t3580264
Tell me outcomes
dksoni411 said:
Here is link for downgrading using LGUP
https://forum.xda-developers.com/tmobile-lg-g5/development/stock-h830-20a-rom-flashable-zips-imgs-t3511294
Here is alternative method for downgrading using lg Flashtool
https://forum.xda-developers.com/lg-g5/how-to/bring-lg-g5-to-life-download-mode-lgup-t3565508
Here is link for rooting
https://forum.xda-developers.com/tmobile-lg-g5/how-to/guide-root-twrp-lg-g5-using-t3580264
Tell me outcomes
Click to expand...
Click to collapse
thank you so much
I have previously tried to root after I went to 20l but wasn't successful. I read about how I needed to downgrade to 20a, then root. However, I had errors when I tried to install the 20a KDZ file with LGUP. My bootloader is unlocked. Does anyone know if you can successfully downgrade and root from 20l?
Update, I was successfully able to downgrade from 20l to 20a, root, then flash autoprime's 20l zip via TWRP. Here is the shortened version of the steps I used.
1. Turn off virus scanner
2. Have latest SU, No verify zip, and 20l flashable zip on SD card
3. Factory data reset on current version (was 20l)
4. Developer options enabled
5. Turn on USB Debugging
6. Plug in to computer, prompt comes up on phone, accept
Do all the steps to unlock the bootloader (mine was already unlocked since I previously tried to do this)
7. Run “Upper Cut” (after LGUP installed)
8. “Upgrade” with 20a KDZ
9. Now on 20a, fresh install, go back in and enable developer options
10. Turn on USB Debugging
11. Plug in to computer, prompt comes up on phone, accept
12. Use Minimal ADB and Fastboot to run all the commands from this post https://forum.xda-developers.com/tmobile-lg-g5/development/root-h830-20a-nougat-lg-g5-hard-t3542496
13. While in TWRP, wipe data, install op sys, install SU and no verify zips.
Quick question, i am using t-mobile H83020i only GSM network, if i downgrade to 20a do i lose GSM unlock?
(I read a lot about people with that problem when downgrading)