Plextor PX-800A and OPTIARC AD-7170A for Mac (firmware version like 1.Nx) have

some updated bootcode (version 0.08). This bootcode support flashing with active

UDMA-mode (classic bootcode version 0.06 have bug, which prevent flashing in

UDMA-mode and you must switch to PIO-mode while flashing). But new bootcode

require compatible firmware (Plextor PX-800A or OPTIARC AD-7170A 1.Nx).

‘Classic’ Optiarc AD-x17xA firmwares not compatible with updated bootcode.

Official firmware updates always check bootcode version and prevent flashing

incompatible firmware. BinFlash 1.41 and newer also check bootcode version if

firmware file provide extra info about required bootcode version and show

warning info. Currently allows to continue even if drive bootcode does not match.

This behaviour may change in later versions.

You can cross-flash your drive with new bootcode (btflash-x17xAp.zip) and use with

compatible firmware - for example convert your Optiarc AD-x17xA to Plextor Px-800A.

If you want cross-flash your Plextor Px-800A to some ‘classic’ Optiarc AD-x17xA you must

flash your drive with Mac OPTIARC AS-7170A firmware (1.Nx) and then use btflashm.exe

with old bootcode (btflash-x17xA.zip).