I just wanted to draw attention to this new feature in the [thread=112103]EEPROM Utility v2[/thread], as it's not obvious in the EEPROM Utilities thread title. It uses an algorithm developed by ala42, which creates the missing data that the 811S firmware requires, by using existing calibration data in the EEPROM. The patch also automatically resets the EEPROM to factory default for burn learning, which other patchers do not do.
The patch is very simple to use and can be done directly in the drive or applied to a file and then copied to the drive. Stock 811S firmware can be used (no crossflash firmware patch is required).
Existing 4x1S@811S owner, that used another patch, can repatch their existing EEPROM and do not need an original EEPROM.
This patch also works in XP SP2.
As always, please remember to backup your EEPROM first.
Please post results here. If you have already crossflashed to an 811S (with another patcher), we would love to see your before and after scans.