Async Buffer Overrun Firmware Support for the MT9234ZBA.

MultiTech recommends customers use firmware version 1.02l (HLQG102L.HEX) or later for use with the MT9234ZBA modem when experiencing buffer overrun errors with certain asynchronous adapters.

Flash Wizard upgrade tool:
http://www.multitech.com/en_US/SUPPORT/Families/MultiModemZBA/software

Firmware Location:
http://www.multitech.com/en_US/SUPPORT/Families/MultiModemZBA/firmware