Sena 20S not taking firmware

Im trying to go back to firmware ver 1.6.2 to eliminate the popping noises from the headset.  Cant seem to get lower than 1.7.1.

I can install 1.6.2 onto the headset but as I soon as I start it up, it locks up and I have to do a hard reset to shut it off.

Any ideas?


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