I had the same issue. Unit loads with a "load error =" and some number (it changes depending on the firmware version). I tried a number of firmware updates (to all available versions) and factory resets to no avail.
I finally made it to work using this procedure:
-do a firmware upgrade from a PC
-In my case I did a downgrade from 1.20 to 1.01, but probably any firmware update would work
-now you have to be quick: when the firmware update finishes, you will se a message on the unit on the lines of "update finished", at this very moment, before the unit reboots automatically, press and hold TAP and the DIAL button down (as you would do for a catory reset)
-The unit will reboot as usual after a firmware update, but the "load error" message will dissapear...
I have no clue why it works in this case and not performing a regular factory reset, but it does
