I have updated one of my PBO's (have a few) to the newest posted here ACRBO firmware. I have been now trying to go back to my original MedeBO (or newest) firmware by going to the system menu, upgrade on the ACRBO and I noticed that it doesn't work. I mean it seems to be rebooting; I see my USB drive flashing; but nothing happens. I've let it go for about 10 minutes; shut off the PBO and I am back to the ACRBO firmware.
Is there a specfic way to back out of the firmware? I don't see any documentation relating to this anywhere.