Uploaded 3.20.3.0 to several Rocket M5 XM and XW and M900 XM units today. On the XM units the far right LED does not come on. Found this on 6 different units. On the XW units the far right LED comes on as usual. Other that that, the XM units perform as normal. I did not have any M2 XM units to try.
Check to confirm, did the images you load correspond to this behavior? Note, due to many devices being covered by a given image, there may be a usable image in both targets for some rockets and nanostations.
Joe AE6XE