Storage type mismatch

I've got tablet Asus MeMo Pad 7 (ME173X). I don't know what happened with him (is it broken physically or by software). Tablet don't respond on buttons, or charger. I connected it to computer dmesg shows (device also disconnect after one second and connect again): usb 2-1.3: new full-speed USB device number 3 using ehci-pci usb 2-1.3: New USB device found, idVendor=0e8d, idProduct=0003 usb 2-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0 cdc_acm 2-1.3:1.0: ttyACM0: USB ACM device Sometimes but very rarely dmesg shows also (including above): usbcore: registered new interface driver cdc_acm cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters usbcore: registered new interface driver usbserial usbcore: registered new interface driver usbserial_generic usbserial: USB Serial support registered for generic usbcore: registered new interface driver option usbserial: USB Serial support registered for GSM modem (1-port) I found stoc firmware, to flash preloader but every time I got error Storage type mismatch! scatter storage type is hw_storage_emmc target storage type is hw_storage_none I was looking some more info. I read some info about meta mode. I tried connect device holding vol up or vol down (both) but device is always recognize as above and flashing also return the same error. Is there any chance to unbrick this tablet?