If your device lost power during the upgrade, the SD file structure was damaged, or the firmware doesn’t boot up for any other reason, you can perform an emergency flash procedure:
- disconnect the instrument from the power source
- plug the USB cable into the instrument
- press the hidden Reset button on the back panel of the instrument and keep it pressed until the instrument will be turned on
- turn on the instrument (with Power button)
- it will automatically flash with a randomly picked firmware .ppf file from the SD card Firmware/ folder