I was trying to update firmware on my STR-DS1250. When I ran the update using a new sandisk usb drive formated in fat32 I was getting a message "NO SUPPORT" I tried a different USB drive, old Kingston Fat32 and with this one the update process started but got stuck at zero percent (on display UPDT 0) even if left for several hours or repeating the process. The problem is now the AV receiver is in update mode (loop) and can't be switched off. When I press the power (off) button it goes back on immediately resuming the update witch always gets stuck at zero percent. If the usb drive is removed it shows NO DEVICE on the display and the receiver does not respond to any buttons.