I have a similar problem and Im hoping that someone can help me
After upgrading to firmware version 2.62 and performing global reset (Following instructions from line 6 ) after being teased with the new amps etc. Unit will not boot just displays LIne6 logo. Can not perform global reset.
Cannot talk to computer to downgrade firmware.
Have tried Different computers different usb cables to no avail.
I have also tried power on with bottom arrow down which displays update flash but can't do anything.
IS bad timing as I have 4 big shows this week and rely on this unit heavily. I had to update as i needed to record and mac wasn't responding via USB.
I Have logged tickets and called distributers but no one is answering.
If any one could help it would be very much appreciated.
Thanks and Regards
Tim