If you read any of the oscam forums they will tell you the opposite, the lower the card frequency the better the ecm times.
As mentioned above
Maximum frequency for this card is formally 5 Mhz, clocking it to 3.57 Mhz
reader started (pid=1234, device=/dev/ttyS2, detect=cd, mhz=357, cardmhz=357)
this is perfectly OK.
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