Apparently, there have been some complaints regarding issues with the connectivity and the SD card of the Samsung Epic 4G. This has resulted in Samsung taking down the Froyo update for the Sasmung Epic 4G in which, over the air manual updates have been pulled.

A hard reset of the Samsung Epic 4G can be done by following these instructions if you are experiencing any problems in this area.

To reset start by:

1. Turning off your phone
2. Hold the volume down, camera and power buttons until the system recovery screen appears.
3. Use the volume keys to scroll to wipe data/factory reset and select that option using the home key.
4. You will see a warning on the screen telling you that you are about to reset your phone and erase all your personal information.
5. Press the volume up key to proceed. Press the volume down button to exit and not reset your phone.
6. After the reset is complete, use the home key to select reboot system now.
7. Your phone will turn off and turn back on.



via: Sprint, Samsung halt Epic 4G's Froyo update due to data, SD card issues | Android Central