Emergency Firmware Update Procedure - CH A1.5 User Manual

When performing a firmware update, do NOT press any of the unit's front panel buttons, do NOT unplug the unit from the AC wall
socket and do NOT turn the mains power switch off. Interruption of the firmware update procedure may result in corrupted
firmware and a malfunctioning unit. If something went wrong during a firmware update and the unit is malfunctioning, apply the
emergency firmware update procedure described in the next section.

5.3 Emergency firmware update procedure

Perform the following Emergency Firmware Update procedure if your unit doesn't power up normally.
1. Perform the operations described in section 5.1
2. Power the unit off (back panel mains power switch to OFF)
3. Push and keep the standby/mute button pushed while powering up the unit (back panel mains power switch to ON).
Keep the standby/mute button pushed for a couple more seconds after you turned the unit on.
4. The unit performs the emergency firmware update. Once the operation is complete, the unit automatically goes into
Standby mode. Remove the USB flash-drive and turn the unit on. The new firmware is now active. To verify that the
firmware update was effective, navigate to the FACTORY SETTINGS menu and select the FIRMWARE VERSION item. The
displayed firmware revision should match the firmware revision on the files copied to the USB flash-drive.
Note: The emergency firmware update procedure lasts 5-10 minutes, do NOT interrupt it!
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