AH26 firmware strongly indicates the drive is Philips based. I have an internal HP DVD Writer 630i drive which has "PHILIPS" printed on the label, along with "V/M:DVD8601/39", also with AH26 firmware.
You should also check to how your drive is identified within Windows. If you see "HP DVD Writer 630c" that's another indication the drive is Philips based.
I don't know if flash converting an external HP DVD Writer dvd630e will be as straightforward as the internal version. My internal HP DVD Writer has been successfully converted to a BenQ DW1620 w/ firmware B7P9, and thus 4X DVD+R DL and 16X DVD-R writing are enabled. I have not done any burn testing with the converted drive, nor do I know if the drive can be reverse converted back to an HP DVD Writer 630c.