I had trouble finding a rom that supported 1.27 but came across ARHD but I have found problems with overheating. My phone came with ICS and 1.27 so can't use revolution.
Hey, use JuopunutBear if you want to S Off.
If you just want to flash ROMs, do the extra 1 step from this guide: http://forum.xda-developers.com/showthread.php?p=25587345
Use the boot.img from the ROM you want to flash.
(You can also enable smartflash in 4EXT instead of manually flashing everytime.)