Sorry, but only a Rockchip editor will work with Rockchip firmwares and at the moment dancemammal's is the best there is.
RKLogoedit and LogoDIY should also work, but LogoDIY is only limited the first few pictures
If you want some menu images to try there are a load here:-
http://www.mympxplayer.org/lots-of-r...-am-df671.html