A simple and functional install.
If you have older rom (2.1)
1: Download
this zip.
2: Unzip it.
It contain jm9, pit 512, odin and a hardcore kernel.
3. Place the doc rom on internal sd.
3: Backup all you want.
4: Enter download mode. Do not plug usb to phone yet
5: Start odin, enter 512 pit, pda, modem and csc, check repart.
6: Plug in usb, press start. Phone will reboot after install, let it boot until you hear the boot up sound.
7: Pull battery and enter download again. Do not plug usb to phone yet
8: Start odin, enter the speedmode kernel in pda
9: Press start
10: Pull batter and enter recovery.
11: Make a factory reset
12: Flash the doc rom.
13: Reboot