PX -740 Crossflash

I’am planning to crossflash my PX-740A to DW 1640. does anyone know if there is a way to save the existing firmware and eeprom?

Discussion can be continued in your other post here: http://club.cdfreaks.com/showthread.php?t=210502

Please do not crosspost in the future as it will make more work for our members. Thanks.