[Custom ArduinoBT] Problem with communication

hello !

first few words hardware:

we have redesigned arduinobt smaller classical one. new arduinobt runs @ 8 mhz (8mhz crystal oscillator).
the rest same.


goal:
send , receive characters pc card , pc card through bluetooth.

a few software tricks did make work:
i had change initialization of serial.begin(115200) serial.begin(230400) data sent card pc correct. (else characters nonsense).
we first tried change f_cpu value in file board.txt 16mhz 8mhz did not change anything; why changed baudrate in serial.

what works

when send characters card pc, works perfectly. (sometimes char error ... 8% error due baudrate chip @ 8mhz)

problem

when send data pc card, first char correct, following incorrect.note if send char after char delay betwee each, works.(unfortunately can't use that)
i know due baudrate problem ....

note have normal arduinobt , works (when using 115200 baudrate of course, [oscillator 16mhz])

anyone has clue or few hints ?

thanks !

no clues or help. question. why not avoid problem , use 16mhz crystal? size factor?

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