I have a question about my new Benq DW-1620 (Crossflashing) from a oem edition with B7T9 original, my question is this, when benq release new firmware I can download from the Benq website and install the update in my oem DW1620 drive?
Yes you can. The B version is used for retail drives so you can flash your drives with upcoming firmwares.
Any already test the HP 630c AH26 firmware on DW1620?
The HP drives are commissioned to-spec by HP. You should probably use the HP firmware for best results.