I have two two airmaster Y11AIRM06.00_Q1CMCSTD_E23. I changed them to version E25, wit the FlashTool 18.104.22.168 program with no problems.
I found problems when I wanted to tranfer a CPB file created.
I followed the instructions appeared in the "Q1 FC50 tool software manual". I created a .CPB file and transferred it to the other controller but nothing changed.
The programs used are following: FlashTool 22.214.171.124 and FC50Tool 126.96.36.199