Android KitKat (4.4.4) for FP1

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Apparently what you found yourself in was Factory Mode / Testing Mode:

Testing Mode

Testing Mode Not to be confused with #dic:recoverymode, #dic:engineermode or #dic:safemode What is testing mode? Testing Mode is a menu on your FP1 where you can test the functionality of lots of the phone’s hardware. This is great to distinguish between hardware or software issues. One important example is the #touchscreentest, but you can test almost all hardware functions. How do I get to testing mode? To get there turn off your FP1, unplug all cables, press and hold the volume down …