Right, I've had enough of this, sending it to service center tomorrow... stockified of course.
EDIT: Change of plans, system status in bootloader won't reset to stock so I am back to Perseus kernel... guess I'm gonna have to actually figure this out after all...
sony xperia z1 c6903 metallic purple
sony xperia z c6603 royal purple - faulty backplate, returned
samsung galaxy s3 lte (gt-i9305n) marble white - sold... no more samsungs for me
htc one x glacier white - dead :'(
apple iphone 4s white - sold