I've read everything on these forums from the 4.0a release and I am still unclear on the following:
If you have a MS28 original drive (flashed with Xtreme 4.0a) and you want to upgrade or downgrade, do you need that 0800 disc or can you use the whole "VIA SATA / 10 slow-seconds hack / non-VCC" to overwrite the firmware.
The reason I'm asking is because the VIA SATA (non VCC) hack requires you to turn off the box a couple of times (off during boot, on for device selection, off when you start flashing and then on for 10 seconds before you select the option - hows that for a short guide ftw? ;-) and I'm not sure when this disc should be inserted (if it even needs to be inserted at all).
Anyone with a stock MS28 that has up/downgraded from a version 4.0 yet and who can say which works?
Thanks for the help

Plug SATA cable from DVD drive to PC. Power cable drive still connected to Xbox 360
Run mtkflash as per normal.
"FirmGuard disables reading/writing of drive firmware. This is always on. Can only be turned off via Enable0800 mode. Do not have SATA cable plugged into Xbox 360 console when in Enable0800 mode"
I dont get this last part. Does it mean that when I turn on the xbox, I should run enable0800, wait 10 sec, then connect my sata cable to xbox dvd while it on? & then use mtkflash?