So at the end just by change a computer and repeat the flash by Nubia tool the phone start working?[/QUOTE]
No not repeat the flash, only copied Nubia Backup directory to another computer, installed drivers and nubia tool, and repeated the IMEI flash and then it worked.
Maybe the reason is that the first computer doesn't boot from c:\ and the tool searches for the boot drive for IMEI flash / Nubia backup.