Question Param preload failed - MSM trying to unbrick Android 12

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andyy1819

New member
May 20, 2021
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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?