Well it is really probably easiest to go ahead and put the "danger" SPL (1.33.2005) on when you root to avoid conflicts later on. Once you have that much done...
Put the ROM on the root of your SD card. (root meaning not in any folder)
1. Power phone off
2. Power phone on by holding the HOME key while you press POWER. Continue holding the home key until you get to the first splash screen. Then you can let it go and this will boot you into your recovery.
3. From recovery (which I will assume you have either CM 1.4 or Amon-Ra 1.2.x) scroll down to the wipe option. Click it. This will wipe your phone data.
***If you would like to clear your Dalvik-cache from recovery, go to console and type:
- Code:
-
mount -o rw /dev/block/mmcblk0p2/system/sd <press enter>
rm -r /system/sd/dalvik-cache/* <press enter>
recovery <press enter>
**Alternately, I believe Amon-Ra's recovery has a Dalvik-cache clearing option***
This should put you back to your recovery menu
4. Select the option to choose any zip
5. Select which ROM you want to flash from the list
6. You will be prompted that you are about to flash <file name> click either Send or Home button (depending on recovery used), So click that.
7. The ROM will begin flashing. Just let it go until it finishes. Once complete it will return you to your recovery menu.
8. At this point you can wipe again just to be safe, or just reboot. You can reboot by pressing HOME+BACK keys or by just clicking the reboot option. I always use the HOME+BACK option since somewhere I read that you should do that. So...
Now once you reboot, you should be looking at your new ROM. You will need to sign back in with your Google credentials and you should be good to go.
Also note, your initial boot up may take up to 10 minutes depending on the ROM. This is normal. (it usually only takes me 3-4 tops)
And if you are going to use one of Cyanogens newer ROMs, the process changes slightly as you have to initially flash 2 separate files. If you are going this way, let me know and I will post the specifics of that if you need it.
If you need anymore help, feel free to gimme a shout.