Different Factory-Default Reset State

The latest wizfi639 module I purchase (Jan 2015) have a factory default reset state with serial port #1 command mode H/W GPIO enabled
The last bach (April 2014) had a factory default reset state with serial port #1 command mode H/W GPIO disabled
How can I set both to be the same state for Factor-Default Reset ?

Firmware version V1.1.28 Factory Resets to Command mode HW gpio disable
Firmware version V1.1.31 Factory Resets to Command mode HW gpio enabled