OK, been on stock rom since I got my S2 i9100 in July and am now contemplating upgrading to JB. My phone is UK T-Mobile V4.04. I have rooted my phone using the script method that doesn't give you the yellow triangle that you get when you flash a different kernel. A couple of things I would like to know. Most roms say do a full wipe when installing them. At what point should you do this? Before actually flashing or once you have flashed. The reason I am concerned is my phone comes back as being susceptible to the brick bug. On my Desire I could copy a Rom to the SD card and flash from there. Can you do the same with the S2, or do you have to use Odin? Is there a particular method that is favoured, and if so why? I believe the leaked version is not a zip file (tar I think from memory) so you have to use odin. I assume you can install CWM and flash others from XDA etc that come in the Zip format. I believe that if I use the official leaked rom that I will also lose root, but will keep it with other roms. (I have found links to how to root again under JB) I assume also that regardless of which method I use I will end up with the yellow triangle. I know there is a way to remove this, for the brave. Have done a bit of reading on flashing the S2, so will probably go for it over the next day or so. Just wanted to clarify a couple of things now, rather than mess it up and have to try and fix it afterwards.