Multiple people have e-mailed me begging for help with data recovery on Surface computers with BitLocker. Apparently they enable TPM secureboot BitLocker by default, but it's a brittle mess and any number of random things can change the PCRs and lock people out forever.
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Looking at reports of people with the same issue, unsurprisingly random updates that may include firmware updates can set this off. Also apparently it can happen if you have the **keyboard attached** to a tablet, and detaching it lets it boot‽
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