QUOTE(tullyfish @ Oct 20 2011, 08:27 PM)

The PDF is 50k smaller so it is different. Just had a quick scan of both and they looks the same, maybe just a typo or something.
One thing that's different is on page 1. The following red text has been added: -
QUOTE
at time of writing the AL1A firmware was used - release will be AL1B
And to update a drive to a higher up model, you do this (done at your own risk - don't blame me if you mess it up!): -
1. Download Flash Utility and EEPROM Utility from the codeguy's page. Make a backup of your flash and EEPROM.
2. Go to the codeguy's page and download the latest firmware for the drive you want to flash to, i.e. if you have a drive that starts with an odd number, get the latest firmware for the 524B and if you have a drive that starts with an even number, get the latest firmware for the 624B. Run the firmware update and have it update your drive. You must use the updates from the codeguy's page to do this, cos the updates from sites like Firmware HQ won't work for this particular purpose.
3. Run EEPROM Utility and click on the CrossFlash tab and hit the "Convert Drive" button, then when it's done, reboot your PC. The PC will detect your "new" drive and it'll show as either a 524B or 624B (depending which you converted it to) in Device Manager.
Throughout this process you must make sure you select the correct drive in the drop down list in either Flash Utility or EEPROM Utility cos if you have multiple burners installed in your PC you could accidentally flash the wrong one.
Once the drive is converted to a 524B or 624B, you can update the firmware using the official firmware updates either via SmartPack or via the stand-alone firmware updates on Firmware HQ. Once you've done that, take another backup of your EEPROM and flash and you're ready to install the Burner Max firmware!