the 'super' partition had about the same size and i tried to flash it. this made it bootloop into fastboot.
it turns, websearching, that 'super' is an extended partition, that contains 'system' inside it as a logical partition. i reflashed my imaged super and the phone works again, AND ! it gives the boot message that my bootloader is unlocked :D it sounds like new versions of fastboot know to look inside the super partition, even if mtkclient doesn't immediately do that
