[LEDE-DEV] New UBNT Loco M2 XW units FYI

[Bill Moffitt]

Folks-

I just got a new batch of Loco M2 units, and they have changed to the XW 
architecture.

I typically downgrade these to AirOS 5.5 (I also work with the Loco M5, 
which has been XW for a while, so I have the 5.5 XW firmware close at 
hand), but these units would not downgrade. I tried doing a tftp 
downgrade and I appear to have bricked the unit. (no matter what I flash 
onto it, the Ethernet port won't work except in "rescue" mode).

The units I received are running AirOS 5.6.12, and I found I could use 
the WebUI to "upgrade" to LEDE. That was surprising... especially since 
using the tftp/"rescue mode" method did NOT work. I have not verified 
that LEDE is working properly, but I could log into the unit.

I have bricked one so far and updated two to AirOS 6.0.6 (the only 
version available on the UBNT download site for the Loco M2). Updating 
to AirOS 6.0.6 initiates the "signed firmware only" capability in uboot, 
so nothing else can be loaded onto them. So I have, essentially, 3 of 4 
units dead on my workbench (I checked the unit that was running LEDE to 
make see if it would still accept firmware via tftp; it only accepts the 
6.0.6 firmware).

I am certainly open to any ideas anyone has... I'll update this as I 
know more.

-Bill Moffitt