I have a root method for the OG Epic on Android 2.3.6 FC09!
All the requirments are that you install ODIN from the link below and download the proper files from the links below as well!!
Step one) put your device into Download Mode
Step 2) Connect to your computer and make sure ODIN recognizes your device
Step 3) Flash the Clockworkmod.tar.md5. Make sure EVERYTHING is unchecked INCLUDING AUTOREBOOT!!!!
Step 4) Once ODIN does its thang, unplug your phone and pull the battery
Step 5) Now reboot into CWM Recovery by pressing and holding the power button, camera, and volume down button until the capacitive buttons at the bottom show
Step 6) Now locate the ROM.zip. It should be called DeodexedFC09.zip
Step 7) Wipe Data/Factory Reset, Wipe Cache Partition, Wipe Dalvik Cache, and if you want Wipe Batt Stats
Step 8) Now reboot, and you should be running Stock Rooted FC09!
CWM TAR: http://forum.xda-developers.com/show....php?t=1357655