[OnePlus 8T Guides, News, & Discussion] Some_Random_Username:
Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been modified before it was cool.

Hi everyone, similar to the previous threads for

OP3, OP3T, OP5, OP5T, OP6, OP6T, OP7, OP7PRO, regular OP7T, T-Mobile OP7T, regular OP7TPRO, T-Mobile OP7TPro 5G, regular OP8, T-Mobile OP8, OP8Pro and OP Nord here are the EDL packages (also known as MSM tools or unbrick tools) that can revive a bricked OnePlus 8T.

You should also be able to rollback your phone to a previous release of OOS with them if for some reason you want to go back to an older firmware :)

You can download the following versions:

KB05AA tools (international firmware):

ANDROID 11:

OOS 11.0

OOS 11.0.1.2

OOS 11.0.4.5

OOS 11.0.5.6

OOS 11.0.7.9

Mirror for first and last MSMs: https://onepluscommunityserver.com/

KB05BA tools (european firmware):

ANDROID 11:

OOS 11.0

OOS 11.0.1.2

OOS 11.0.4.5

OOS 11.0.5.6

OOS 11.0.7.10

Mirror for first and last MSMs: https://onepluscommunityserver.com/

KB05DA tools (indian firmware):

ANDROID 11:

OOS 11.0

OOS 11.0.1.2

OOS 11.0.4.5

OOS 11.0.5.6

OOS 11.0.7.9

Mirror for first and last MSMs: https://onepluscommunityserver.com/

Tips:

While crossflashing does not seem to break your /persist unlike on 8-series, it is advised that you back it up before attemting to do so as fingerprint reader may give an error related to enrollment issue. You can do so by using dd if=/mnt/vendor/persist of=/sdcard/persist.img (you must have root access, which is not something I'm going to explain here) and moving it to your computer/cloud.

Instructions:

Launch MsmDownloadTool V4.0.exe.

Windows 7 users may use MsmDownloadTool V4.0_Win7.exe instead, but it hasn't been tested.

On the login prompt select "Other" in the dropdown menu and click on Next.

Wait a few seconds until main window shows up.

Click on Target button and select O2 while using global tool or India while using indian tool or EU when using european tool.

Press Start button (this is done so that device will be "captured" automatically by tool instead of going back to normal boot after 10 seconds)

Power your device off.

Let it cool down for one minute.

Hold both volumes in to get in Qualcomm EDL mode and the screen will stay black. While holding, plug in the USB cable from your phone to your computer. Let volumes go alter plugged in.

Wait some time (should not be longer than ~300 seconds).

Enjoy your brand new device.

FAQ:

Does this work on Mac or on Linux?

Unfortunately no, tool is Windows only. You should need at least Windows 7.

Why is my antivirus freaking out when unzipping the archive or running the tool?

In an effort to protect reverse engineering from being done (and by extension prevent conversion process like it was done on 6T and 7Pro), OnePlus now use VM Protect V3 in their MSM tools. As this tries to detect debug environment, this is seen as malicious behaviour by some antivirus.

My device isn't detected when I click on "Enum" button

Go to device manager and make sure your phone shows up as QDLOADER 9008.

If it shows up as QHUSB_BULK, it means Qualcomm driver wasn't installed automatically by Windows Update. Download the latest one from Microsoft website at http://download.windowsupdate.com/c..._fba473728483260906ba044af3c063e309e6259d.cab (source https://www.catalog.update.microsoft.com/Search.aspx?q=qualcomm hs usb 9008 ) and install it manually by right clicking on QHUSB_BULK and selecting "Update driver software" and "Browse my computer for driver software" to where you downloaded CAB file.

MSM tool is stuck on "Param pre-processing"

Ensure you're using the Qualcomm drivers linked above.

MSM tool is stuck on "Sahara communication failed"

Unplug your phone, get in fastboot mode, turn off phone, wait 15 secondes and get back in Qualcomm EDL mode. You can also try using a USB 2.0 port instead of a 3.0 one.

What is SMT Download mode?

Just don't try to unlock that mode, it will wipe your IMEI and your Widevine certificate if you use it.

How can I fix "SMT config not found" error?

Please refer to https://xdaforums.com/showpost.php?p=83448961&postcount=61, all credits to @Shadow12347 for finding it out.

Why is my device getting in Qualcomm crashdump mode in spite of a successful download?

Your unit was most likely manufactured after March 9th 2021, see https://xdaforums.com/t/op8t-oos-kb...ice-to-oxygenos.4180837/page-14#post-84789741 for reference. You therefore need to use HydrogenOS 11.0.7.12 MSM to recover your device linked at https://www.oneplusbbs.com/thread-5886794-1.html (mirrored at https://mega.nz/file/O8UySbgR#cXGlHkdA_7CYEhKIrek9zzAEwJ7Vx1D5BZdemnPlvGE by @pikatenor ). Getting new OxygenOS MSM tools is nowadays impossible unless you own the device it is meant for, so OP will not be updated to add new OxygenOS MSM tools allowing to workaround this issue. Feel however free to reach out to me in DM if you would like to get told how to maximise your chances to obtain one.

Credits:

@viperbjk for KB05AA and KB05BA OOS 11.0 files

@LLStarks for KB05AA OOS 11.0.1.2 file

@FullOfHell for testing 11.0 KB05AA tool and downgrade possibility

OnePlus for the device and OS