TWRP guide for LG g820n

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AsItLies

Senior Member
Nov 4, 2009
1,673
614
tucson
Samsung Galaxy S10
Hello, can someone help me with a detailed guide to flashing TWRP on my LG g820n. I'm kinda new to all this😅.

I can give you an overview of how to / why do it. But it would be much easier if you mentioned which android version you're running, and then find a copy of that boot loader with twrp already injected.

twrp is no longer in it's own recovery partition, so 'flashing' it is not the same. It has to be ram disk injected into the boot partition. To do that, you actually need the / a device with twrp already working, as it's an option in twrp to ramdisk inject the twrp image.

In some cases, if you have a version of fastboot that will boot certain versions (that are bootable) of twrp, then you can use it to do the 'ramdisk' inject twrp.

As said, mention the version of android you are running, the boot partitions with twrp are around for all of them.
 

AsItLies

Senior Member
Nov 4, 2009
1,673
614
tucson
Samsung Galaxy S10
Whew, I didn't think I could know any less 😅.
Anyways, I'm running Android 11.

So what you'll have to do, to use the attached zip file, is to be; 1) rooted, 2) use magisk manager to create the boot partition with magisk installed, 3) use qfil to flash the newly created boot partition with magisk (be sure to save off your original boot partition first), 4) flash the attached zip file with magisk manager which will inject twrp into boot partition.

You'll get a message after doing above saying you're now 'unrooted'. But to fix that just use twrp to flash magisk zip.
 

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So what you'll have to do, to use the attached zip file, is to be; 1) rooted, 2) use magisk manager to create the boot partition with magisk installed, 3) use qfil to flash the newly created boot partition with magisk (be sure to save off your original boot partition first), 4) flash the attached zip file with magisk manager which will inject twrp into boot partition.

You'll get a message after doing above saying you're now 'unrooted'. But to fix that just use twrp to flash magisk zip.
If I'm already rooted and trying to get TWRP for flashing ArrowOS, is this what I should do?

Flash TWRP with magisk > flash ArrowOS with TWRP > Flash magisk with TWRP > Reboot?

And does any of this require modifying the abl_a.bin file again to get into fastboot mode or can it all be done on device?
 

AsItLies

Senior Member
Nov 4, 2009
1,673
614
tucson
Samsung Galaxy S10
If I'm already rooted and trying to get TWRP for flashing ArrowOS, is this what I should do?

Flash TWRP with magisk > flash ArrowOS with TWRP > Flash magisk with TWRP > Reboot?

And does any of this require modifying the abl_a.bin file again to get into fastboot mode or can it all be done on device?
I'm not familiar with the process for installing after market roms, look in the guides section or even better, follow the info that's specific to arrowOS, there should be some doc available.
 
I'm not familiar with the process for installing after market roms, look in the guides section or even better, follow the info that's specific to arrowOS, there should be some doc available.
These are the instructions given

  1. Boot TWRP
  2. Make backups
  3. Tap Install -> Select Rom zip
  4. Go to reboot menu -> Select opposite inactive Slot
  5. Reboot recovery
  6. Now in Arrow Recovery
  7. Factory reset
  8. Apply Update -> Flash Magisk if any
  9. Reboot system now
I'm just confused on the TWRP part as the first step is to boot TWRP and that's what I'm confused about. The only guide I see on here for installing TWRP is for the sprint version.

I also see some people talking about different GSI related things and some don't mention it all, I'm a bit confused with it all haha