No delete that firmware.bin and regenerate the firm files with the py script make sure all 3 bin files add upto 3.40MB then place the firm folder in the root rxtools folder then delete the data folder under the rxtools root folder and try again @wurstpistole is wrong ignore him
Interestingly, I've run the python script under OS X at least 4 times, and each time it comes back with a 3.60MB size... 3,568,640 bytes to be exact.
Do you have a SHA1 on your file?
Thanks.