Remove ATT Rom and going to a non att stock rom

[MrSalue]

Hello,

I Just bought from a website a " refurbished " LG V20 and sadly when I turned it on I was shocked it was on att but it's unlocked, but sadly since it's at&t I can't get software updates, is there a way that I can have a stock rom on it instead off at&t? if yes can you guys show me how ?

Note: I have 0 experience and how to do these kind of things but I can follow guide lines.

 

[runningnak3d]

Search for backup EFS. Do it.

Then feel free to flash the US996 KDZ. Again, if you search, there is plenty of info.

-- Brian

 

[cnjax]

Search for backup EFS. Do it.

Then feel free to flash the US996 KDZ. Again, if you search, there is plenty of info.

-- Brian

Yep no spoon ? feeding

Sent from my LG-H910 using XDA Labs

 

[MrSalue]

thank you fr the reply!

I did this set uphttps://forum.xda-developers.com/v20/how-to/guide-root-twrp-lg-v20-using-dirtysanta-t3722278 and i finshed it but now I am a bit confused on which rom to download follow guide lines , giving a help wull be nice >.>

 

[cnjax]

thank you fr the reply!

I did this set uphttps://forum.xda-developers.com/v20/how-to/guide-root-twrp-lg-v20-using-dirtysanta-t3722278 and i finshed it but now I am a bit confused on which rom to download follow guide lines , giving a help wull be nice >.>

Again no spoon ? feeding, try them out and find the one you like

Sent from my LG-H910 using XDA Labs

 

[MrSalue]

Again no spoon ? feeding, try them out and find the one you like

Sent from my LG-H910 using XDA Labs

I don't want to "try" I just want to know which is a normal stock rom with no bloatware that I can have root on x.x!!

you are making it so difficult on me xD

 

[cnjax]

I don't want to "try" I just want to know which is a normal stock rom with no bloatware that I can have root on x.x!!

you are making it so difficult on me xD

No one is making anything difficult, search the forum, read the OP of rom threads until you find what you're looking for, how difficult is it to do some reading,? #NoSpoonFeeding

Sent from my LG-H910 using XDA Labs

 

[runningnak3d]

• Download patched LG UP
• Download US996 10p KDZ
• Place your phone into download mode. With the phone off, hold vol up and plug in the USB cable.
• In LG UP, use the DUMP option and select modemst1, modemst2, persist, persistent and misc
• Then while still in LG UP, use partition DL mode, select the US996 KDZ, select all partitions, and flash.

Enjoy your H910 converted to a US996.

If you have data or voice problems after the conversion, then you will have to root to fix it. You can't root on 10p firmware, so you will have to flash older firmware. Even though you will have flashed the US996 firmware, you can use the H910 root procedure here. Once you are rooted, you can flash a US996 stock ROM via TWRP to return to stock US996 (with or without keeping root -- tis up to you).

Once rooted, you can flash modemst1 and modemst2 (ignore the others, it is just a good idea to have backups of them) that you backed up in step 3.

• Boot to flastboot. With the phone off, hold vol down and plug in the USB cable
• fastboot flash C:\path\to\modemst1 modemst1
• fastboot flash C:\path\to\modmst2 modemst2

Again, those steps will ONLY be required if for some reason you get unlucky and your EFS gets hosed.
@cnjax Hope that is a chick, cause I decided to hold her hand good.....

-- Brian

 

[cnjax]

Download patched LG UP
Download US996 10p KDZ
Place your phone into download mode. With the phone off, hold vol up and plug in the USB cable.
In LG UP, use the DUMP option and select modemst1, modemst2, persist, persistent and misc
Then while still in LG UP, use partition DL mode, select the US996 KDZ, select all partitions, and flash.

Enjoy your H910 converted to a US996.

If you have data or voice problems after the conversion, then you will have to root to fix it. You can't root on 10p firmware, so you will have to flash older firmware. Even though you will have flashed the US996 firmware, you can use the H910 root procedure here. Once you are rooted, you can flash a US996 stock ROM via TWRP to return to stock US996 (with or without keeping root -- tis up to you).

Once rooted, you can flash modemst1 and modemst2 (ignore the others, it is just a good idea to have backups of them) that you backed up in step 3.
Boot to flastboot. With the phone off, hold vol down and plug in the USB cable
fastboot flash C:\path\to\modemst1 modemst1
fastboot flash C:\path\to\modmst2 modemst2


Again, those steps will ONLY be required if for some reason you get unlucky and your EFS gets hosed.
@cnjax Hope that is a chick, cause I decided to hold her hand good.....

-- Brian

Lmao with a nick starting with Mr, you might be in for a surprise

Sent from my LG-H910 using XDA Labs

 

[XblackdemonX]

He got spoon fed

 

[AWT86]

• Download patched LG UP
• Download US996 10p KDZ
• Place your phone into download mode. With the phone off, hold vol up and plug in the USB cable.
• In LG UP, use the DUMP option and select modemst1, modemst2, persist, persistent and misc
• Then while still in LG UP, use partition DL mode, select the US996 KDZ, select all partitions, and flash.

Enjoy your H910 converted to a US996.

If you have data or voice problems after the conversion, then you will have to root to fix it. You can't root on 10p firmware, so you will have to flash older firmware. Even though you will have flashed the US996 firmware, you can use the H910 root procedure here. Once you are rooted, you can flash a US996 stock ROM via TWRP to return to stock US996 (with or without keeping root -- tis up to you).

Once rooted, you can flash modemst1 and modemst2 (ignore the others, it is just a good idea to have backups of them) that you backed up in step 3.

• Boot to flastboot. With the phone off, hold vol down and plug in the USB cable
• fastboot flash C:\path\to\modemst1 modemst1
• fastboot flash C:\path\to\modmst2 modemst2

Again, those steps will ONLY be required if for some reason you get unlucky and your EFS gets hosed.
@cnjax Hope that is a chick, cause I decided to hold her hand good.....

-- Brian

Thank you, your post is the first one I found that makes it seem fairly simple.
I have 2 V20 h910s I want to unbrand, one running AT&T version 10m and one running 10r (which complicates matters further), and I would like to avoid installing a bootloader/root/etc. which prevents future updates/upgrades to later software versions (so other existing guides have put me off for multiple reasons).

Is what you listed all I need to do (in both cases), or do I need to root (or bootloader unlock etc.) first?
Can I install any future stock US996 ROMs (ie when Oreo is released) once I have done this, or will I have to reverse the steps and start over with h910/ATT software?

 

[dark_prince]

I don't want to "try" I just want to know which is a normal stock rom with no bloatware that I can have root on x.x!!

you are making it so difficult on me xD

Edit: Brain explained to you rather more profoundly. I rest my case of explaining it further

 

[AWT86]

Edit: Brain explained to you rather more profoundly. I rest my case of explaining it further

Hi.

I also have a few questions (as I'm new to this and have found conflicting information, and in addition I have two h910 phones running different firmware versions, one v10m and one v10r).

1) My phone's aren't rooted - Is what Brian explained all I need to do, or does his explanation require a bootloader-unlocked/rooted phone to work?
2) Are there any requirements/restrictions (eg. original firmware must be above/below version XYZ - if yes, does it make any sense to update the firmware to the latest AT&T version first)? Can I install any future versions of US996 KDZ that way too?

Thanks in advance.

 

[dark_prince]

Hi.

I also have a few questions (as I'm new to this and have found conflicting information, and in addition I have two h910 phones running different firmware versions, one v10m and one v10r).

1) My phone's aren't rooted - Is what Brian explained all I need to do, or does his explanation require a bootloader-unlocked/rooted phone to work?
2) Are there any requirements/restrictions (eg. original firmware must be above/below version XYZ - if yes, does it make any sense to update the firmware to the latest AT&T version first)? Can I install any future versions of US996 KDZ that way too?

Thanks in advance.

1. For 10m one, follow Brian's guide, for v10r, follow Brian's guide. Once you have unlocked bootloader/rooted, you have conceded official updates. Also there are no stock KDZ restoring methods to revert back to H910 but you can try a method to go bone-stock H910 if you're rooted and have TWRP recovery.
2. For H910? no, and no need to upgrade to latest att firmware. You can just jump the gun to US996
Edit: Make sure you take full backup dump with patched LGUP (from Brian's guide as well).

 

[AWT86]

Thanks

1. For 10m one, follow Brian's guide, for v10r, follow Brian's guide. Once you have unlocked bootloader/rooted, you have conceded official updates. Also there are no stock KDZ restoring methods to revert back to H910 but you can try a method to go bone-stock H910 if you're rooted and have TWRP recovery.
2. For H910? no, and no need to upgrade to latest att firmware. You can just jump the gun to US996
Edit: Make sure you take full backup dump with patched LGUP (from Brian's guide as well).

Thanks a lot.

Two final questions (sorry to bother you):
1) Do I need to root/bootloader-unlock the device BEFORE proceeding to use Brian's guide, or can I just dump & then flash US996 straight away without rooting? (I read somewhere that root is only required if the signals fail after US996 conversion, but I'd rather ask than to skip root / just flash and then realize I messed up).
2) Will EFS be backed up in the process of dumping everything using patched LGUP, or do I need to back up EFS manually/seperately? If the latter is what I need to do, what is the best method? (I've found multiple, but most of them require root, which I'd rather avoid unless necessary)

 

[dark_prince]

Thanks a lot.

Two final questions (sorry to bother you):
1) Do I need to root/bootloader-unlock the device BEFORE proceeding to use Brian's guide, or can I just dump & then flash US996 straight away without rooting? (I read somewhere that root is only required if the signals fail after US996 conversion, but I'd rather ask than to skip root / just flash and then realize I messed up).
2) Will EFS be backed up in the process of dumping everything using patched LGUP, or do I need to back up EFS manually/seperately? If the latter is what I need to do, what is the best method? (I've found multiple, but most of them require root, which I'd rather avoid unless necessary)

1. Make a backup dump and flash US996 rom.
2. I havent known anyone who ran into corrupted EFS after crossflashing between H910/H915/US996. The restoring of modemst1,modemst2,modem, misc solves the problem of No baseband/IMEI. Do that at your own risk, there is no guarantee that you'll be safe from apocalypse

 

[runningnak3d]

Thanks a lot.

Two final questions (sorry to bother you):
1) Do I need to root/bootloader-unlock the device BEFORE proceeding to use Brian's guide, or can I just dump & then flash US996 straight away without rooting? (I read somewhere that root is only required if the signals fail after US996 conversion, but I'd rather ask than to skip root / just flash and then realize I messed up).
2) Will EFS be backed up in the process of dumping everything using patched LGUP, or do I need to back up EFS manually/seperately? If the latter is what I need to do, what is the best method? (I've found multiple, but most of them require root, which I'd rather avoid unless necessary)

You do not have to root, just follow my post for flashing the US996 KDZ.

You only have to root IF you have signal issues, because that is the only way to fix them. Even then, you don't have to stay rooted.

I doubt you will have signal issues, but make sure you backup those partitions before you flash the US996 KDZ.

-- Brian

 

[AWT86]

You do not have to root, just follow my post for flashing the US996 KDZ.

You only have to root IF you have signal issues, because that is the only way to fix them. Even then, you don't have to stay rooted.

I doubt you will have signal issues, but make sure you backup those partitions before you flash the US996 KDZ.

-- Brian

Hi.

I'm having trouble with LGUP. When I try to dump all phone files, it gives me an error 0x2000 saying "not enough hard disk space", even though there should be more than enough.
Device Manager recognizes the device under Ports as "LGE AndroidNet USB Serial Port (COM8).
Help would be highly appreciated.

Thanks in advance.

EDIT: I managed to dump the files you recommended, but what about the rest? shouldn't I back those up too?

---------- Post added at 11:51 AM ---------- Previous post was at 11:24 AM ----------

You do not have to root, just follow my post for flashing the US996 KDZ.

You only have to root IF you have signal issues, because that is the only way to fix them. Even then, you don't have to stay rooted.

I doubt you will have signal issues, but make sure you backup those partitions before you flash the US996 KDZ.

-- Brian

UPDATE: I flashed the first device, but it asked for a password that wasn't set up. UPDATE 2: solved w/ factory reset.

Thanks a lot and sorry for bothering you guys.

 

[runningnak3d]

Glad you were able to do it.

As far as backing the other files up -- no, you can get those from a KDZ, so no reason to back them up. The partitions I had you backup are specific to your phone(s).

-- Brian

 

[AWT86]

You do not have to root, just follow my post for flashing the US996 KDZ.

You only have to root IF you have signal issues, because that is the only way to fix them. Even then, you don't have to stay rooted.

I doubt you will have signal issues, but make sure you backup those partitions before you flash the US996 KDZ.

-- Brian

Now flashed both devices, but noticed that the signals are unstable. Network jumps randomly from no network to 4G and back to no network etc - not in high frequency, but often enough for me to have noticed.
Does that mean I now have to go the route of rooting or is there anything else I can try?

Thanks and sorry to bother you once more.

PS: just noticed it seems to run stable with only 3G enabled, but once 4G is enabled the problem starts.