Default [Q] Bricked XT890

Hi. The problem is as follows: phone stuck on boot screen. I can boot into fastboot mode, but choice of any menu item returns to the boot screen. Accordingly, I can't boot into recovery. I flashed a different recovery (stock, CWM, TWRP), but still can't boot into it. I also tried to flash system. Fastboot writes following: "BLKDISCARD ioctl /dev/block/mmcblk0 fail".
I could be wrong, but I think that is a hardware problem, because /dev/block/mmcblk0 is internal memory.
I hope for your help.

P.S. Sorry for my bad english.
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