Question Param preload failed - MSM trying to unbrick Android 12

[andyy1819]

Hi, so the Android 12 beta soft bricked my OP9 and im stuck in pin verification loop. Im trying to revert back to Android 11 using MSMDownloadTool but every time i press start when the phone is connected in EDL mode, it returns "Param preload error" after about 10s. I tried different ports, i tried reinstalling all the drivers but then every time i hit the param preload error. I dont know what to do about it. I have european OP9 model (or i at least think so) but the downgrade is availible only in T-Mobile or India versions. Is that the problem, should i wait for european?

Is there perhaps simpler way to reset the OP9 back to Android 11 since it still boots up and its not hard bricked?

 

[TheKnux]

Try fastboot flashing a ROM using a flashall.

 

[nujackk]

Press start on msm first. So you see waiting on phone. Then reboot to edl mode.
It only works on the first few seconds of edl otherwise always fails.

 

[XNine]

Where did you get the MSMtool, and will you share it?

 

[nujackk]

Where did you get the MSMtool, and will you share it?

OnePlus 9 11.2.22.2 (T-Mobile) MSM Download Tool

Oxygen OS 11.2.22.2.LE54CB (T-Mobile) Download: https://drive.google.com/file/d/1-5RC9f8es6ZrwpYKKQBMmw5gW-rzDSfZ/view?usp=sharing Size: 2.92 GB MD5: b6fc004c81d311109f66cceb3f375862

xdaforums.com

This is for t-mobile version.

 

[craznazn]

MSM tools are region/brand specific