Ok, so my SII was working great all this time running 2.3.6 GB. I decided to investigate updating the OS a bit more and finally figured out I needed the Kies software (I was trying to use Kies Air...d'oh). Anyway, I plugged it in - it saw the update, and I let it rip. 15 minutes later it was done and the phone was up and running just fine. First issue I noticed, ICS 4.0.4 keeps having trouble with my custom ringtones/notifications. Sometimes as I'm fiddling with it I can try to play them - nothing happens. Other times I'll open sounds just to see "Unknown Ringtone" and "Unknown Notification" and no sound will play - I can open the list of ringtones and notifications and all that shows up are the default Samsung ones. Never had this problem ever with 2.3.6. Another more serious issue is regarding the data. I walk across a campus with strong spotty Wifi so I walk in and out of Wifi as I cross the campus. I like to stream Pandora as I walk, on GB I could definitely get an entire song played and then sometimes at the end of the song the phone would hang up for a bit before it plays the next one. Now I'm getting frequent stops in the middle of songs where it's buffering - it seems like it's trying to use just Wifi but I have data turned on so it should be switching between the two when necessary. Additionally, when I hit the back key now it's far less responsive. In 2.3.6 the back key would go back almost always - now nearly any slightly non-responsive process can render the back key useless. I always used the Dolphin HD browser for internet and I'm now having issues logging into websites, most notably my university website. I can click to select and enter my username, but if I try to select the password box nothing happens. I end up going to task manager and Dolphin HD is using about 70 MB of memory and between 45%-50% of the processor showing up in red. No matter how many times I try this always happens. It also happens with the default web browser. I'm at a comlete loss, what in the hell went wrong? The phone seemed to udpate and install just fine but it's acting stupid and quirky since I installed ICS. If my above issues are atypical and there's no given solution, can I put my phone back to 2.3.6? I like the new data manager and the YouTube app but I'll gladly give those up for my more stable and responsive GB. Long ago I owned an iPhone 3GS and I'm not kidding, upgrading to a new version of iOS with Jailbroken software was less stressful than this - and that's not even a legitimate thing. I fail to understand why this has happened, especially since other people swear ICS is so great. Seems the SII isn't fast enough to run it - just from what I'm seeing so far. Any help on how to fix this or how to restore my phone to 2.3.6? If I restore it, what information will I lose?