Alright, finally - sorry for the delay.
A550
- as mentioned on the kbd.c thread only powers on using play button
- FWT works in single and continuous mode
- but switching to Play in either cases causes the CHDKPTP connection to be dropped
- this is not a crash, one can press connect again, press Rec and go on
- in Play mode the unknown image screen shows and after that CHDKPTP says ERROR: not connected
There also is a problem with the UI overlay. What's displayed alternates between odd and even button presses, that is many items are not visible every second time and generally the color is off.