[EVO 4G Q&A, Help & Troubleshooting] topdawgn8:
I would just say read...but I did just type up a How-to for my buddy yesterday so copy/paste isn't out of the question. Ignore any personal specific things that are included. This is provided you have FULLY ROOTED your phone. I'm not liable for jacking anything up etc, etc.

Ok, here’s the quick and dirty.

Files you need: download on your phone

Radios:

http://www.mediafire.com/file/yqau3epazcyqdu3/EVO_Radio_2.15.00.07.28.zip

http://www.mediafire.com/file/72eqb78zi71abk8/EVO_WiMAX_26023_R01.zip

ROM: Only choose one

Rooted version of Stock OTA: http://massmirror.com/7f191510efa40b999eec50b09e9dd116.html

*or*

The ROM I’m running now: http://deck.alexauv.com/s3vo_1_2-D_080310_005245.zip

[Edit: I have since updated to Fresh 3.1.0.1]

Download quickboot from the marketplace

Procedure:

1. Move the radios and the ROM you chose to the root of your SD card using whatever file explorer you use. I’m pretty sure you have ES File Explorer on the ROM you have now.

2. Open up People from your app drawer and navigate to Menu>Import/Export>Export to SD Card. This puts a .vcf file on your SD Card. Import after the flash to get your contacts back.

3. You should be good with titanium backup by now. Just remember after you flash, start Titanium, click the problems button, and download the new version of busybox. To do your back up, tap Backup/Restore>Menu>Batch>Restore Missing apps + Data

4. Open up the quickboot program you downloaded from the market and tap “Recovery”. Let the phone reboot to the console.

5. Go to Backup/Restore and press Power to select.

a. Select Nand Backup by highlighting and pressing power

b. Press Power again to confirm

c. If you have issues with 2.2 you can always come back here and restore your current ROM by using your Nand

6. Go back to the previous menu by pressing both up/down on the volume toggle. This can be tricky at times.

7. Highlight Wipe, press power to select

a. Highlight and press power to select, then power again to confirm on the following:

i. Wipe Data/Factory reset

ii. Wipe Cache

iii. Wipe Dalvik – cache

b. Return back to the main menu by holding in both volume keys

8. Navigate to Flash zip from sdcard

9. Highlight and press power to select the Radio-2.15.00.07.28.zip

a. Press power to confirm

b. If it doesn’t take you back to the main menu, return to the main menu and select “Reboot System Now”

i. This reboots the phone and updates the radio.

ii. If it brings you to a black screen with a phone and arrows making a circle, don’t worry this is normal

iii. Once it’s finished, it should reboot back to recovery

10. Return back to flash zip from sdcard

a. Highlight and select the Wimax update26023

i. Follow the same process for the radio

ii. Phone will boot back to recovery

11. Return to flash zip from sdcard

a. Highlight and select the ROM you chose to download

i. Press power to confirm

ii. Sit back and enjoy the script

b. If it does not take you to the main menu when it is finished. Return to the main menu and reboot your phone.

12. Congratulations…you are now running a rooted version of the 2.2 update.

Unless stated otherwise, if you’re on XDA and you see a ROM you want to try out, follow these same steps except the updating radios. You can make Nand backups of each ROM so you can switch between them and see which ones you like better.