Slower baudrates communication (autobaud)

[Rinin]

It's FTDI based converter and it works fine with the same board and default firmware.
Even on 7812bps (9600*12/14.7456) because default 14.7456MHz oscillator was replaced with 12MHz

I understand that it's not flash magic issue, but default firmware works ok and 12MHz oscillator seems also starting.
Thats why I want to flash it with 12Mhz RedBoot and forget about onchip bootloader.

[Andy Ayre]

I have no idea why it can't autobaud at higher speeds. Perhaps put a scope on the Tx and Rx pins, send the '?' and see if anything looks strange. Or you could try using the high speed comms mode in Flash Magic.

[Rinin]

Thank you, Andy for fast and professional responces, it is pleasure to meet such high level of support.

Issue was in opto-isolator of my USB-UART, it worked almost fine, but slightly affected first byte only.