How to undo b7v9 firm ware

This firmware has slowed my burn speed by over a min and half and i want to undo it any way?. 1620pro


Flash it to whatever BenQ compatable firmware you want to use-

Firmware can be flashed to older or newer versions - the flashing program will warn you that you are trying to flash to an older version - just click through it-


Speed isn’t everything. Flash to the firmware that gives you the best quality scans for the type of media you regularly use.