Hi,
Actually, you only need to hold rec button along with “either” power key or reset key.
There is no “hold them both” case.
The logic here is simple, if the board is not yet powered up, then you have to use power key since the reset key has no function under such situation.
Thus, the steps in such case are press/hold rec → press/hold power key → release power key → release rec.
And if the board is already in power on state, then what you should is using the reset key.
Thus, steps become: press/hold rec → press/hold reset key → release reset key → release rec.
Please try them, if the module still cannot get into recovery mode, then please file RMA request.