M) Download a .tar kernel file from Captivate Development Section for the ROM your installing. Note: I9000 is for I9000 -------based ROM and I897 is for I987 based, its very important you select the correct one.
N) Open the kernel flasher Odin3 v1.85.exe and run as administrator.
O) Add your chosen .tar kernel to the PDA box and uncheck auto reboot.
P) Turn on phones USB debugging.
O) Power down phone. Enter your phone into Download Mode by using one of the methods below.
Q) Plug USB cable into phone and PC. Note: Yellow com port will light up.
R) Press START.
S) Once its complete The green [PASS!] will be lit up in the Odin Kernel flasher.
T) Now unplug the USB cord and close the Kernel flasher and pull the phones battery and put it back in.
U) Enter your phone into Recovery Mode by using the method below.
Vol UP + Vol Down + Power = Recovery. Note: Release buttons when AT&T screen comes up.
T) Once CWM recovery opens navigate to find your ROM package, and flash using method below. 1. install zip from sd card 2. choose zip from sd card 3. Find your ROM package .zip and select it 4. Select -Yes- install your ROM package .zip 5. Your ROM will install. Enjoy!