[GUIDE][A/B][Q][M205x] How To Install GSIs on Galaxy M20

[Haridhayal]

How To Install GSIs on Galaxy M20
​

Bugs:
- Volte (will never work)

Requirements:
- Must be on OneUI 2.0.
- Unlocked Boot-loader & TWRP 3.4.0-0 or newer version installed.

Instructions:
1) Boot into latest TWRP.
2) Download any Android 10 ARM64-A/B variant GSI. (From here)
3) If its not in .img format extract it to .img format.
4) Flash it as system image.
- Optional: Resize system partition if you want to flash gapps.
5) Do factory reset.
6) Flash following 3 patches
- Magisk (Necessary to boot)
- dm-verity and forced encryption disabler (attached below)
- The-Phix (Fixes Camera, Media playback, MTP, Screen Lock) (Download from here)
7) Reboot

Tested GSIs :
- AOSP
- LineageOS

Credits:
SamarV121 - Fixing the bugs and TWRP.
XXXTC3X - Testing

XDA:DevDB Information
Q GSIs on Galaxy M20, ROM for the Samsung Galaxy M20

Contributors
Haridhayal
ROM OS Version: Android 10

Version Information
Status: Stable

Created 2020-07-01
Last Updated 2020-07-03

 

[Haridhayal]

- reserved

 

[eltahir]

lineageos booted but automatic restart evrey 10 min

 

[Haridhayal]

lineageos booted but automatic restart evrey 10 min

You didn't flash the Phix .zip

 

[sunnatter]

MTP, fingerprint, wide-angle cam, lockscreen, PIN, sdcard are still not working on Phhusson build even after flashing the-phix.zip.
Bugs on lineage os: mtp, fingerprint, cam, lockscreen, bootloop, sd card, PIN, browser are not working.

 

[alfadyn]

MTP, fingerprint, wide-angle cam, lockscreen, PIN, sdcard are still not working on Phhusson build even after flashing the-phix.zip.
Bugs on lineage os: mtp, fingerprint, cam, lockscreen, bootloop, sd card, PIN, browser are not working.

yes i did it like 10 times currently on havoc os 3.7

and the only things that dont work are MTP and Lock Screen even after the phix.

 

[sunnatter]

yes i did it like 10 times currently on havoc os 3.7

and the only things that dont work are MTP and Lock Screen even after the phix.

You didn't get bootloop after the second boot?

 

[alfadyn]

You didn't get bootloop after the second boot?

nope. but i switched to vanilla android aosp from phhuson. and the only thing i need a lock screen fix. mtp is also not working but it s not that important for me.

 

[sunnatter]

nope. but i switched to vanilla android aosp from phhuson. and the only thing i need a lock screen fix. mtp is also not working but it s not that important for me.

Cool. Before i tried gapps from phhusson and lineageos 17.1 but lineage seemed to have more bugs.
I also want to test uport (unbutu touch port) later on.

 

[sunnatter]

nope. but i switched to vanilla android aosp from phhuson. and the only thing i need a lock screen fix. mtp is also not working but it s not that important for me.

Aosp from phhusson has the same issue is bootloop after i reboot. Is havoc a better option?
I would like to switch to custom rom instead of stock rom, since sometimes i got annoyingly bizarre reboot without any reason.

 

[xxxtc3x]

You didn't get bootloop after the second boot?

I think the reason why your phone is bootlooping is because you tried setting up a lockscreen. You have to delete the keystore.mdfpp.so file in /vendor/lib64/hw/ for the fingerprint sensor to work and not cause bootlooping issues.

---------- Post added at 07:02 AM ---------- Previous post was at 06:56 AM ----------

Aosp from phhusson has the same issue is bootloop after i reboot. Is havoc a better option?
I would like to switch to custom rom instead of stock rom, since sometimes i got annoyingly bizarre reboot without any reason.

Try using the most recent aosp/lineage gsi update. The random app crashes and other issues (like camera not working) have been fixed
To fix mtp flash this in twrp: drive . google. com/file/d/1YoBxX--hI_WC43isSrLghOQnb5wW6-QZ/view?usp=sharing (I'm spacing out the link cause I'm not allowed to post links yet)

 

[sunnatter]

I think the reason why your phone is bootlooping is because you tried setting up a lockscreen. You have to delete the keystore.mdfpp.so file in /vendor/lib64/hw/ for the fingerprint sensor to work and not cause bootlooping issues.

---------- Post added at 07:02 AM ---------- Previous post was at 06:56 AM ----------


Try using the most recent aosp/lineage gsi update. The random app crashes and other issues (like camera not working) have been fixed
To fix mtp flash this in twrp: drive . google. com/file/d/1YoBxX--hI_WC43isSrLghOQnb5wW6-QZ/view?usp=sharing (I'm spacing out the link cause I'm not allowed to post links yet)

Thanks man, i appreciate it. I will try it out soon.

 

[Siddharthkumar195]

Device doesn't boot

I've followed all the above instructions but the device doesn't boot past Samsung Logo screen.
What could I be doing wrong

 

[sunnatter]

I think the reason why your phone is bootlooping is because you tried setting up a lockscreen. You have to delete the keystore.mdfpp.so file in /vendor/lib64/hw/ for the fingerprint sensor to work and not cause bootlooping issues.

---------- Post added at 07:02 AM ---------- Previous post was at 06:56 AM ---------

And how do you fix the lockscreen?

---------- Post added at 06:39 AM ---------- Previous post was at 06:38 AM ----------

I've followed all the above instructions but the device doesn't boot past Samsung Logo screen.
What could I be doing wrong

Pls describe more detail or else we can't guess what you did wrongly.

 

[thes3usa]

Tried this on my M20, but as above it does not go past the Galaxy M20 Splash screen. Stuck there and does not progress. Will update if I find a fix.

 

[sunnatter]

Everything works fine bro

---------- Post added at 02:18 AM ---------- Previous post was at 02:17 AM ----------

Tried this on my M20, but as above it does not go past the Galaxy M20 Splash screen. Stuck there and does not progress. Will update if I find a fix.

What gsi did you use?

 

[tanle2702]

has anyone tried and got a stable working device? i wanna try, but im too afraid because this phone is my only daily driver

 

[thes3usa]

What gsi did you use?

I tried most GSIs but only PHH based GSIs boot. A few issues like Camera are still there for some reason.

 

[sunnatter]

I tried most GSIs but only PHH based GSIs boot. A few issues like Camera are still there for some reason.

You are right. Recording has some problems and the phone speaker is softer than on stock rom.

 

[tanle2702]

has anyone tried and got a stable working device? i wanna try, but im too afraid because this phone is my only daily driver

update: tried havoc (v3.7), lineage (17), blissOS 12.10, CAOS, AOSP. Stayed on havoc 3.7, no magisk.
Everything is working, havent tried volte yet, but:
-fingerprint
-screenlock
-camera (back and front, no ultra wide angle)
-face unlock
-speakers
-wifi
-bluetooth
-fast charging
are working.
There are a few bugs: wifi doesnt automatically connect after first time entering password, wifi sometimes disconnect when browsing google photos (other apps are fine), no auto brightness, choppy scrolling in chrome (firefox is smooth).
p/s: M205G variant