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Make sure the FIFO buffers are turned on if the user has a 16550 UART. If the buffers are on, try juggling with their settings until the error goes away.
Also try lowering their port speed to 9600 (set the FIFO buffers back to default) and work your way up the port speeds one by one until the error reoccurs. If the error occurs at 9600bps then the modem may be damaged, get the user to contact the manufacturer.
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