Bullet 2HP (FCC ID: SWX-B2)

I have acquired a Bullet 2HP (FCC ID: SWX-B2) and it has a non-functioning reset button on the unit and when I try to use the POE reset, it does go into the proper light sequence for a reset.  It will not take the AREDN firmware like my other two Bullet (which are the Bullet M2 (FCC ID: SWX-M2B)).  I did go the the UBNT web browser and was able to upload the Bullet to a more current firmware of XS2.ar2316.v4.0.4.5074.150724.1340

I see the OpenWrt that Not recommended for future use with OpenWrt due to low flash/ram, so I assume I have a unit that can not be used due to it being an earlier verison with low RAM.