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DISCLAIMER: I AM NOT RESPONSIBLE IF YOU BRICK / RUIN YOUR PHONE IN ANY WAY.
BASIC COMPUTER SKILLS REQUIRED
IF YOU DO NOT KNOW WHAT ROOT IS ... YOU PROBABLY DON'T NEED IT

PROCEED WITH CAUTION

Installing the Radio Update

Next you will want to confirm your Radio Baseband.
To Confirm this Press Menu - Settings - About Phone - Scroll down till you see Baseband version.
Compare the Baseband value to the table below to see if you are using the correct radio for your build or if you need to update.

To update the Radio:

1 Download the Radio zip.
2 Rename it to "update.zip".
3 Copy it to the root of your phone's SD card.
4 Turn your phone off.
5 Start up in recovery mode by holding Home and pressing Power.
6 Press ALT+S to apply the update.
7 Once the update is applied press Home+Back to reboot the phone. The Phone will start to boot up and then continue applying the update. Once this is completed the Recovery menu will ask you for the second time to reboot the phone via Home + Back

Once this is done double check the Baseband has been updated properly via:

Press Menu - Settings - About Phone - Scroll down till you see Baseband version, you should see the radio version on this row if not you will need to update the Radio again.

To Confirm which Radio you should be using check the table below:

To Continue on please go to NANDROID Backup