Have had a Samsung Galaxy S2 for 2 years and never updated OS (2.3.6) because I did not want to lose the App data (primarily Angry Birds 3-star games). I got a GS4 few days ago and would like to move the apps with data over, but having lots of difficulties because of old OS. Tried MobileGo (moves apps not data) and micro SD (Sandisk 64 GB Ultra 10). Is it possible and how or the Angry Birds are lost? Additionally, when I moved some apps and data to sd in GS2 (FAT32 format) and placed the sd card into the GS4, the data disappeared, but the app remained. Is that because GS4 can only read exFAT? Also, some of the apps now have a string title, e.g., com.rovioangrybirdd.exe, and are not accessible even back in the GS2. Is there a way to restore such apps and data?