Looking to dual-boot two ROMs on your AT&T Galaxy S2 SGH-i777? Here’s a video tutorial showing you how to do that. Dual-booting two ROMs can have great benefits, that you can run a stock-like TouchWiz ROM and AOKP ICS ROM side-by-side. For people on the go (like myself) who need to test out several ROMs on the go, this feature really saves time and headache of backing up and restoring different ROMs.
You will need to run ICS ROMs though and install Siyah kernel for both ROMs you run.