This may not be the right place, but today I did a manual update remotely and my emontx stopped working.
I got home thinking it was a hard reset required but no. I then wrote this new image to the SD card and started from scratch. Still no emontx. After reading the update logs I figured out how to fall back the RFM firmware manually (on a hunch) and went from latest (/home/pi/emonpi/firmware/compiled/latest.hex) to V2.5 in the archive directory. Restarted emonhub and the emontx is back.
My emontx is an off the shelf unit, non-updated from Sept/Oct last year.
I should note that during this kerfuffle the emonpi and emonth nodes were absolutely fine.
Update: Found your change for V2.6 here Glyn: There's a way to reset the rf module? · Issue #92 · jeelabs/jeelib · GitHub - I guess something’s gone wrong for my config. Anything I can do to help, including SSH access to test f/w ?