I've signed into Insider program (since long ago actually, first time was for 8.1) but ever since unable to update my 920 to W10, every time the Download is finished and the phone enter the gear screen, after merely <10% progress the phone jumps back to the home screen (8.1 still) stating the same error (forgot which, but looked it up it's not a phone specific error, but also sometimes happen with PC ver) sick of trying I'm still using 8.1 in Cyan even right now. But now school demands for me to have 2 features that it currently lacks, Bluetooth Keyboard and USB OTG ( Lumia 920 DO support this right?) and willing to do a Hard resert to the phone if it can solve the problem. But, should I do that or defer and wait for the official launch for old Lumias? (which still far off it seems) please suggestion.