Just bought a Avalon 821 and it's not linking up with my other avalon 741's? Even tried it on it's own uac 3. Anyone know the reason? Goes from blue to green back to blue?
Um, perhaps read the 1st few pages of this thread?
The A8xx uses different controller firmware than the A7xx series and the 2 versions are not compatible...
A821 controller image is here: https://canaan.io/downloads/software/avalon821/openwrt/20180305 from there pick which flavor of RasPi you are using and burn the image to the controller sd card.