I was able to downgrade mine to the previous release, using the forced upgrade procedure from Garmin. I have the echomap file zip if you want to try it (if your chartplotter is on the Echomap list at Garmin). I got it from a brother on BBC. Garmin will tell you how to do a forced load, but will not give you the older file. I figured someone may have saved it, and was right. I normally use AC, so I didn't have the file, but I do now. My Ultra went from 11.2 back to 10.0, and the GLS10 from 2.30 (the bad) to 2.20. Headed to the lake in a few to try it out.