In addition, does your FP2 happen to have a slim case (= white, red, turquoise or indigo)? Check if the power button is blocked (permanently pressed), that might have caused the endless reboots.
If this is the case, you can try to remove the case and put it back on a few times until the button works without problems. If that is without success, here is a solution that has been the ultimate solution so far for this problem:
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