Hi Artem!!! On my system after create UBI device /dev/ubi0_0 it was not created... I did check... here is a result # cat /sys/class/ubi/ubi0/dev 253:0 # ls -l /dev/ubi0 brw-rw---- 1 root root 253, 0 Jan 1 00:11 /dev/ubi0 best regards, Evgeny