You have to go back to version 2.3.3. Search for the Ascend2 2.3.3 Stock Rom and download it. This will remove your Muve Music offered by cricket. But that is a choice you have to make.
If you are getting a unexpected error, you need to have Net Framework installed.
1.) Make sure your in debugging mode on your phone (settings/applications/development)
2.) Extract the downloaded file
3.) Create a folder named 'dload' on the root of your sdcard
4.) Open the extracted file and put the "update.app" in the dload folder
5.) Copy update.zip to the root of the sd card
Now All you have to do is go into the Phones Setting->Storage->Software Update. It automatically recognize the file and updates.
After you have completed this, follow the steps of rooting you had been using prior to this.