So to install ICS download all files to your sd card.
You can try either AOKP or CM9.
follow these steps to install ICS and use safestrap.
If you wish to use safestrap you MUST remove all traces of bootstrap on your device.
so lets start.
Steps to make a backup in non-safe mode
1. Reboot the phone
2. At splash screen press menu key. You are now in CWR.
3. Select backup and restore.
4. Select backup.
5. Should take about 1-3 minutes here.
6. go back
Done with the backup.
Steps to go into safemode.
Turn on safemode (this will take a couple of minutes so relax for a bit)
Now you are in safe mode.
Steps to flash rom
go into mounts and storage
wipe dalvik cache
select install zip from sdcard
select choose zip from sdcard
select internal or external (depends on where you downloaded it)
select file and flash rom
flash gapps (make sure you flash gapps right after you flash the rom)
go back and reboot.
When it reboots it will take a while to reboot. do not think you are on a boot loop. just sit back and relax.
So after you have flashed your rom (AOKP or CM9) you have to flash gapps right after. Do not reboot after you flash your rom!!! you MUST flash the gapps file after you flash the rom!!! Then reboot.
If you have no data 4g/3g you can dial *#*#4636#*#* and select phone information then scroll down to gsm/cdma auto (prl), next select gsm only and the screen will turn dark or blink once. after that bring the drop down menu again and select gsm/cdma auto (prl) again and there you have it 4g/3g.