I am not giving up yet
1- is this the md5 for your firmware.bin?
A9DCD99A360E8629810F8ED08403D746
If yes, then it is correct
2- can I ask you to give me the crc-32 for the rxtools.dat instead of md5? That's the only checksum I can see on my work PC :/
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Yep, I figured out your problem (I think) it is just as I suspected, your rxtools.dat is outdated. The correct md5 is:
5518AE169D649135
Clear your browser cache and redownload the release zip from GitHub. It should be working after that
Edit: and if your firmware.bin is the md5 above, then you are fine only replace the rxTools.dat after ensuring it has the correct md5