Plextor Japan has released a statement on how to handle the existing Autostrategy database when upgrading the Firmware on a PX-716, PX-755 and PX-760:
The request regarding PX-716/755/760 series firmware update.
The request regarding "PX-716/755/760 series" firmware update The ãƒ—ãƒ¬ã‚¯ã‚¹ã‚¿ãƒ¼ product the patronage granting thank you always truly. When until recently drew up the media data base which was drawn up or automatically remains from AutoStrategy function, there is a possibility function of the new firmware not operating sufficiently. After doing even, when there is a problem in entry grade, that deletion it receives the former media database with PlexTools Professional of product attachment, we ask firmware update.
To sum it up in a sentence: Plextor recommends to delete an already existing Autostrategy database using Plextools before applying a firmware-update to the drive in question, since the old database might not work properly with the new firmware.