[sOLVED!]
For those of you having the same problem as me, I fixed it by using the power cable that it was shipped with, rather than the USB power cable. Because I am in the UK, I had to use a shaver to mains adapter.
Thanks everyone.
Hey guys, me and a friend got our hands on the AP121U via ebay and were hoping to flash them with the Jasager firmware.
We followed the guide to the letter and used UART cables to flash the factory binaries onto the devices. However, they enter into a boot loop after resetting them.
I can hit 'f' and return to drop into failsafe mode, where we're presented with the following prompt:
root@(none):/#
I've tried starting dropbear to scp over the Jasager files to /tmp/, but I can't even establish a connection (yeah, I'm using the PoE port).
Any ideas would be much appreciated.
P.S. I thought it could have been a dodgy AP121U, but my friend's does EXACTLY the same thing as mine.