[OnePlus 6T  Guides, News, & Discussion] carbon271:
Hey Guys today I wanted to share a little tutorial on GSI so if you guys didn't know the One Plus 6T supports Treble Natively So with that being said you can Flash GSI

I am on latest 9.0.11 I have not tested any other firmware

WARNING IM NOT RESPONSIBLE IF YOU GET A BRICK OR YOUR PHONE SELF DESTRUCTS JUST USING MY KNOWLEDGE TO FIGURE THINGS OUT FOR OUR USE

OFFICIAL INSTRUCTIONS

This arent my steps I found them looking around and decided to test and add Some Things from my part and finds all credits of these steps go to the author of the thread.

The correct installation procedure of a GSI on the One Plus 6t

Make sure you unlocked the bootloader and that you have the latest ADB and Fastboot from Google, I used minimal ADB worked fine for me but CAUTION if it doesn't download the latest ADB from google

Now in Fastboot flash, the following, WITHOUT rebooting in between! this needs to be done all in one go!

THE FIRST STEP DO NOT MISS

First Step

Boot to Twrp and you need to flash the avbctdisable.zip

Link- https://drive.google.com/open?id=1GhZK04FDx7WlyKb32qq0gR-SO0t51CVE

2nd Stage

fastboot flash boot_a boot.img

fastboot flash boot_b boot.img

Use the STOCK boot image!

Then flash the GSI system image of your choice

ON A/B Partition

fastboot flash system_a gsi.img

fastboot flash system_b gsi.img

Replaced by the first Step Ignore

Then flash STOCK vbmeta image with the specific commands!

Command for VBMETA

fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img

ONLY USE A/B ARM64BIT GSI

Continue to Next Steps

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Extra steps I had to do When flashing if you are flashing any GSI DO NOT FLASH TWRP AFTER

STEPS After GSI flashed

1.Boot TWRP thru Fastboot

2.Wipe Data and Dalvic Art Cache

3.Flash the TWRP installer

4.Reboot to System

5. Reboot To Twrp Flash Gapps

6. Reboot To Twrp Flash Magisk And Optional Custom Kernel

7.Reboot

8.Profit

Original Link Thread

https://xdaforums.com/oneplus-6/how-to/treble-mistery-solved-developer-t3800716

Download Links-

TWRP- https://xdaforums.com/oneplus-6t/development/recovery-unofficial-twrp-touch-recovery-t3861482

List of GSI- https://github.com/phhusson/treble_experimentations/wiki/Generic-System-Image-(GSI)-list

Magisk- https://xdaforums.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445

Gapps- https://opengapps.org/

OOS 9.0.11 Fastboot- https://androidfilehost.com/?fid=11410963190603886130 YOUR GONNA NEED THE BOOT.IMG FROM HERE

Thanks To All The Devs That Make Development Possible Once Again all Credits Go to them this is just a write-up.

KEEP IN MIND NOT ALL GSI WORK PERFECTLY KEEP IN MIND

ISSUES YOU MIGHT BUMP INTO

CRASHES

SOME THINGS NOT WORKING

LIKE WIFI, BLUETOOTH ECT...

(FOR RR PIE GSI POST SPECIFIC)

For Flashing RR Pie GSI

STEPS

1. Boot to Twrp and you need to flash the avbctdisable.zip

Link- https://drive.google.com/open?id=1GhZK04FDx7WlyKb32qq0gR-SO0t51CVE

2. Reboot to Bootloader

3. Flash OOS Stock 9.0.11 Img

fastboot flash boot_a boot.img

fastboot flash boot_b boot.img

4.Then Flash GSI

fastboot flash system_a RR.img

fastboot flash system_b RR.img

5. Then Fastboot boot to TWRP

6.Wipe Data and Dalvic Art Cache

7.Reboot to Fastboot

8 .Fastboot Boot to Twrp Again then Flash Twrp Installer

9. Reboot Device After Fully Boot Reboot To Twrp Flash Gapps, Magisk, Optional Custom Kernel

10. Profit

Links-

Ressurection Remix-

https://xdaforums.com/project-trebl...0-resurrection-remix-v7-0-arm64-32-b-t3891636

Gapps-

https://opengapps.org/

FOR ERROR 70 WITH GAPPS

Steps

Boot Twrp

Click on wipe

Advance wipe

Click on system

Then Repair or Change File System

Then Resize File System

Flash Gapps Profit.