If people want to try this out...
1) Download the BIN from here...
*Edit: link removed... reason? Because the resources are around for you to do this yourself... 1) download UYS1 from dhc014.rpc1.org 2) Remove the EEPROM check using the EEPROM Check Remover tool found on my website 3) bitsetting-hack it using my automated tool 4) speedhack it using my automatd tool 5) auto-BS hack it using my automated tool
*Edit2: For people wanting to use 451S@U18A or 851S@U18A (not for those wanting 812S@U18A), go here... (the 51S@U18A version there posted has bitsetting fixed, so it works) (look for the GSU1 firmware, which is the UYS1, but specially modified for 451S/851S)
2) Load the BIN with LtnFW. Check Update Bootcode.
4) C0deKing also suggests that you do a full power down and restart after the first burn.
Although there is no direct EEPROM modification involved in the process, it may still be worthwhile to back it up, just in case.
Edit: New stuff added below...
The UYS1 FW has been reported to solve some write quality issues with the 451/851. So if you have write quality issues, you may want to consider trying out this FW. This FW will give you 8x +R regardless of which burner you have (451/851/812), but it will give you 8x -R only if your burner was originally an 812S. 8x -R on the 451/851 with this firmware does not work; you'll have to use 4x for your -R.
Edit: Ignore the stuff below...
I tried to do something similar to this with 812S firmware a while back. It was not successful. But C0deKing believes that because this is UYS1, the results will be different... I haven't had a chance yet to test this out, but if you're curious, you could read about my little experiment with this on the 812 firmware in this thread:
code65536 crosses his fingers and hopes that this experiment with UYS1 will turn out better than his experiment with US0A