I just tried to upgrade it from 4.2 to 4.4.2 using a guide online and it's bricked itself it gives me the error message:
SW REV CHECK FAIL : [ABOOT]FUSED 3 > BINARY 2
I've searched everywhere for an answer and none of the unbrick methods currently out there seem to work.
Any attempt to unbrick causes the same error message to appear:
SW REV CHECK FAIL: [ABOOT]FUSED 3 > BINARY 2