All 4 tone lights (or ABCD lights on the FX100) flashing is 'recovery mode'. It is the intended behavior after a failed update. If you come across this mode, you must attempt to update the AMPLIFi again.
- Power down your AMPLIFi.
- When updating via PC, please connect the USB cable and make sure to boot the unit while holding Tone+Tap (amp, TT) or A+C (FX100) to put your AMPLIFi into Update Mode. Run the Line 6 Updater program found at www.Line6.com/software. For a guide, please refer to http://line6.com/support/page/kb/_/amplifi-products/ampl/how-to-update-amplifi-with-a-pc-r701.
- If you still get failed updates from the Line 6 Updater, try another USB cable and port as well as another computer
- When updating via an iOS device, Bluetooth works in recovery mode, but the pairing from before the failed update is not maintained. You must press the Bluetooth button and pair again from the smart device's Bluetooth menu. You can then proceed with the update.