[OnePlus 9RT] Valdem:
Greetings,

I've appreciated @abhinavgupta371, @HELLBOY017 for initial version of this firmware and @penguinus for continuous support and testing.

PLEASE NOTE THAT FASTBOOT ROMS CAN ONLY BE USED IN DEVICES WITH AN UNLOCKED BOOTLOADER!!!

AND BE WARNED THAT UNLOCKING DEVICE WILL WIPE INTERNAL STORAGE COMPLETELY.

THIS ROM UNOFFICIAL AND BASED ON IMAGES MANUALLY EXTRACTED FROM MT2111 DEVICES AND OTA UPDATES

This ROM can be used on MT2110 devices (Chinese version initially delivered with ColorOS) for migration to OxygenOS

Device bootloader can be locked after flashing this ROM

Attention: this ROM only for the migration from COS Android 11 to OOS Android 11. Do not try to use it for switching to/from other version of Android. This can lead to the boot loop.

You can find ROMs maintained by @penguinus which are more universal than these and allow to switch between Android versions.

Everything related to SafetyNet checks is working on this ROM like on original MT2111 devices.

If device is not rooted it can receive OTA updates.

Known issues:

- Device name in settings displayed incorrectly "Lahaina for amd64" instead of expected "MT2111". Fixed in latest firmwares.

Migration instructions:

- On your PC, install bootloader drivers for OP9RT and check if device is recognized in Bootloader and Fastbootd modes.

- Ensure you're using the LATEST version of SDK platform tools (adb and fastboot)

- On your PC, download the Fastboot ROM zip from the download link below.

- On your PC, unzip downloaded file

- On your PC, navigate to its now-uncompressed folder

- Reboot your OnePlus 9 RT to bootloader mode.

- Connect the OP9RT to your PC

- On your PC open command line window in the uncompressed folder,

- type install.bat

- wait till device boot to "Setup wizard" screen (it will take 5-7 min)

- at this point device bootloader can be locked if you need this.

Upgrade instruction (for devices with OxygenOS where standard updater decline update):

- follow the installation procedure till

- instead of install.bat you need to run upgrade.bat in command line window

- user data will be preserved

Good luck!

Edit:

Some linux users reports issue with device wipe during installation. It is related to fastboot dependencies. It requires android platform tools installed.

As an alternative after final reboot (device should reboot automatically twice during installation) device will boot to recovery mode where you need to wipe it manually.

DOWNLOAD LINKS:

Fastboot ROM OxygenOS A.11 zip:

4.3 GB file on MEGA

mega.nz

boot.img OxygenOS A.11

https://mega.nz/file/RVAXCJya#SXukMoZbmWqScbSuE3iVtTEYYkYlOt8eajfV8xCIOdI

Fastboot ROM OxygenOS A.08 zip:

https://mega.nz/file/LYFElKaL#9-gO2xVEenHufecxaDSTRTUuCuJY-QlxIRRbSUtHfo8

boot.img OxygenOS A.08

https://mega.nz/file/kJQyCCTS#VHy7tzjPEhDlrtZm1v1AB-lmEN4ckx5dUVlnX0YZ0gs

Fastboot ROM OxygenOS A.07 zip:

https://mega.nz/file/4JZ2XRiT#7fIk6nL0V9zkr02CcGL9tgxiVJPfJpYN1S8jA-DAxE8

boot.img OxygenOS A.07

https://mega.nz/file/dZpHiAYI#eEuNHhz7nO0dCqFJrl3kK57s2PAnwr7zfa2UvBecgAE

Fastboot ROM OxygenOS A.06 zip:

https://mega.nz/file/QZQQUZqZ#3PntyL67g71AneyGKjPD5UH-gVyTxHk21MkLoTxojpA

Fastboot ROM OxygenOS A.05 zip:

https://mega.nz/file/MBgg2AjJ#98vdiFZPUCMm9gskDu5SQmic-D8jHZ3snO8pLbqrbFY

Fastboot ROM OxygenOS A.04 zip:

https://mega.nz/file/oFhjDKrI#jUajmG5fAeH1TvYS3b6EZB6Pwj5MzDpAt47fwr6gurM

https://disk.yandex.ru/d/U8WxNFOFU4rDfA

Credits:

- @abhinavgupta371

- @HELLBOY017

- @penguinus

Updates:

[2022-02-22] fixed installation and upgrade for some specific device state (if you have installed previous version successfully, you doesn't need re-installation).

[2022-03-01] add A.05 version of firmware.

[2022-03-11] add A.06 version of firmware.

[2022-03-20] add A.07 version of firmware.

[2022-05-23] add A.08 version of firmware.

[2022-06-06] update A.08 version of firmware (fixed issue with telegram by @penguinus).

[2022-07-20] add A.11 version of firmware (prepared by @penguinus)

[2022-10-12] add attention message about downgrading.