This is ALL that you need:
- Droid RAZR Utility (to flash back to 219)
- The ICS leak on your external sd card (around 350 MB, to install the leak)
- The matching kernel for your leak (around 8 MB, for the leak to work)
- Unstick Tool with the 219 files (to flash the new kernel)*
* If you don't have the FULL unstick tool, you'll need to have the 219 files.
If you want to root your phone, you can do that afterwards.
Also, I think it's worth mentioning that I wasn't able to flash the leak I had on my sd card because it was in a folder named "download" and recovery wouldn't scroll down past a certain point. If you have lots of folders, put the leak in a folder near the top of the list (mine was in "/mnt/sdcard-ext/Android", for example), or you won't be able to select it when it comes to flash the leak.