[OnePlus 8T Guides, News, & Discussion] IAAxl:
This can:

Bypass TMO flash lock as it uses 9008 EDL.

Remove TMO sim lock and oem lock as you will be using global rom.

Convert your KB2007 (KB09CB) to KB2005 (KB05AA) as much as possible. (Although you're using the latest KB2005 firmware, any LineageOS stuff, such as LOS system,LOS recovery and LOS fastbootd, will still recognize it as KB2007. This is the same in OOS 11. But in OOS 12 system, it shows and acts like a KB2005.)

Should enables dsds (dual sim dual standby) in OOS 12. (Not tested. But status bar shows two empty sim slots in KB2005 OOS 12. After I flash LOS 19.1, slot 2 won't act unless boot with "persist.radio.multisim.config=dsds" prop.)

Give you access to Global OxygenOS firmware. (Bye slow TMO~)

Probably give you better overall condition (e.g. partition) than some fastboot scripts, as it's done directly by 9008 EDL.

AND THIS WILL DELETE ALL YOUR DATA ON DEVICE!!!

Actually, you should be able to change any brand device to any version you like by this method, but take your own risk as nothing is solid tested.

This can't:

Give you a second IMEI. (In OOS IMEI2 is "null". I guess it's hard baked somewhere.)

Remove TMO flash lock or unlock a locked bootloader. (You still need unlock token for that.)

You tell me please. I don't have enough time to test everything.

Please:

BE AWARE THAT YOU ARE RESPONSIBLE FOR WHAT YOU DO TO YOUR HARDWARE, NOT ME.

MY SUCCESS DOESN'T MEAN IT MAST HAPPENS TO YOU.

YOU ARE THE ONE WHO TAKE ALL THE RISKS. (And your phone, too.)

Be kind to other readers and help them, I can't stay online all day, sorry.

Why:

I own a fully unlocked KebabT running LineageOS 18.1, and I decided to try LOS 19.1 out.

But OOS 12 firmware is so buggy that it even broke my LOS instance, and the fastboot (not fastbootD, for hell reasons I can't enter LOS recovery AFTER ALL firmware upgrade) is also too buggy to fix my issue.

I unbricked my phone using this " https://xdaforums.com/t/op8t-oos-tmo-kb09cb-unbrick-tool-to-restore-your-device-to-oxygenos.4180981/ " (Thanks for sharing!!!), but only to find that TMO firmware is so old, buggy and limited.

Then I googled and found this "https://www.droidwin.com/convert-oneplus-t-mobile-metro-to-global-on-locked-bootloader/" and this "https://github.com/bkerler/oppo_decrypt" ,but they are slightly outdated and doesn't fit kebab.

I fetched global firmware from here "https://xdaforums.com/t/oneplus-8t-rom-ota-oxygen-os-repo-of-oxygen-os-builds.4193183/" (Thanks for sharing!!!) and started trying.

After a few tries I succeed and decided to share what I found.

How:

Firstly, know your hardware. Especially your ram type (ddr4 or ddr5) !

Then follow what this "https://www.droidwin.com/convert-oneplus-t-mobile-metro-to-global-on-locked-bootloader/" said, BUT WITH EXTRA MODIFICATION on your "settings.xml":

1. Overwrite "BasicInfo Project", "Version", "ModelVerifyPrjName", "ModelVerifyRandom" and "ModelVerifyHashToken", these makes you pass MsmDownloadTool's pre-check.

2. Scroll to the end of file and overwrite [Target ID="1" Desc="O2"] with [Target ID="101" Desc="TMO"], otherwise your flash won't begin as the tool can't find right hardware to flash.

3. Search for "Image ID=" and modify the results. For me, I have a DDR4 device, so I go with "xbl.img" and "xbl_config.img", so FOR ME I change "Image ID="1"" to "Image ID="101"", and change "Image ID="65537"" to "Image ID="65637"". Otherwise MsmDownloadTool won't be able to locate the right xbl img file to flash.

4. Follow the rest of that great guide and have a few tries, you won't lose more as you're already under EDL mode. Wish you success!

And:

Sorry in advance for any possible confusion as I'm not a native English speaker. You can ask in replies!

Please let me know if I'm wrong, I'll try to correct.

If this is already shared by other great guys, please forgive me as I really didn't find any related post in this forum.

I doubt this "https://xdaforums.com/t/guide-conve...m-unlock-or-bootloader-unlock-needed.4188491/" (Thanks for sharing!!!) is done in the same way but no one mentioned about it.

Special thanks to bkerler for creating this awesome "https://github.com/bkerler/oppo_decrypt" project!

Special thanks to LuK1337 for maintain LineageOS for OnePlus 8T!! You're great!!

Question:

It it possible to remove flash lock in this way?

I've tried several times to flash with kebab not kebabT MsmTool. But I can't make it work.