[EVO 4G Android Development] kpkimmel:
If you're looking for a way to have working WiMAX with the 1.47.651.1 update and keep your root access, try this. It exhibits some interesting behavior at the end that is not seen with other update methods, which leads me to believe that this method does correctly upgrade the WiMAX.

There is confirmation that this method yields a working WiMAX/4G. And screen grabs.

Step 1: Revert to the initial release of everything

This PC36IMG.zip contains all the original firmwares from the first released RUU (hboot, boot, recovery, system, userdata, microprocessor, touch panel, radio, and WiMAX), except the HBOOT has been replaced with the one from the engineering build (to give you unlocked NAND) and the recovery has been replaced with Amon RA 1.7.0.1 (so you can flash updates signed with the test keys).

Note: This process will only work if you already have the engineering HBOOT. (If you have NAND unlocked, you already have it and can proceed confidently.) If you'd like to check the actual version, you can boot into HBOOT and look near the top of the screen: it should say HBOOT 0.76.2000, not 0.79.0000. If you have 0.79.0000, you will need to do Toast's Part 2 first before starting here.

1. Download this file, rename it PC36IMG.zip, and put it on the root of your SD card however you like.

* PC36IMG-1.32.651.1_eng-hboot_RA-1.7.0.1.zip (md5=413285641ee70e8c197f38cea649205b)

2. Power off your phone.

3. Hold down the Volume Down and Power buttons until the white screen appears.

4. HBOOT will scan the PC36IMG.zip file. You'll see a blue progress bar on the right side of the screen.

5. When it's finished scanning, it will ask if you want to start the update. Press the Volume Up button to answer Yes.

6. Wait a while for it to flash all the images.

7. When it finishes and asks if you want to reboot the device, press the Volume Up button to answer Yes.

8. Your device is brand new again, except you have unlocked NAND and a custom recovery.

9. Delete the PC36IMG.zip file from your SD card.

Note: You will not have root at this point. This is to be expected, as you are running a totally stock system partition now. The key is that you have a custom recovery installed, meaning you can apply the su-2.1-e-unsecure-signed.zip update as described below, which will install the su and Superuser.apk files (i.e., give you root access).

Step 2: Rapid-fire updates

1. Download these three files to your SD card:

* su-2.1-e-unsecure-signed.zip (md5=a055c916168db7e61a75a37a13993cd6)

* OTA_Supersonic_1.32.651.6-1.32.651.1_rootsafe.zip (md5=7ecc89be93b3834babd782ca17e97b39)

* OTA_Supersonic_1.47.651.1-1.32.651.6_rootsafe.zip (md5=1326bf00bcdcb6937a8cccd2a82c69fb)

2. Power off your phone.

3. Hold down the Volume Down and Power buttons until the white screen appears.

4. If you forgot to delete PC36IMG.zip from your SD card, HBOOT will scan it again now. When it asks if you want to start the update, press Volume Down to answer No. When it asks if you want to reboot, press Volume Down again.

5. Now you should be at the HBOOT menu. Press Volume Down to move the selection to RECOVERY and press the Power button to select it.

6. In a moment, you'll be at a different looking menu.

7. Using the Volume and Power buttons as before, select "Flash zip from sdcard."

8. Select su-2.1-e-unsecure-signed.zip from the list and follow the prompts to flash it.

9. When that's finished and you're back at the menu, select "Flash zip from sdcard" again, choose OTA_Supersonic_1.32.651.6-1.32.651.1_rootsafe.zip, and follow the prompts to flash it.

10. You will now be updated to 1.32.651.6.

11. Ignore the warning that says "ignoring attempt to do multiple firmware updates."

12. It will say "Reboot via menu to complete installation." Do as it says and choose "Reboot system now" from the menu.

13. Now the first radio baseband update will be installed. Don't touch anything. The phone will reboot on its own, and you'll wind up back at the recovery menu.

14. Choose "Flash zip from sdcard," select the second OTA update, OTA_Supersonic_1.47.651.1-1.32-651.6_rootsafe.zip, and follow the prompts to flash it.

15. You will now be updated to 1.47.651.1. This one takes a while. Let it do its thing.

16. When it's finished flashing, it will tell you to reboot. Do as it says and choose "Reboot system now" from the menu.

17. Now the second radio baseband update and the WiMAX update will be installed. This takes a long time and doesn't display any progress on the screen, just an icon with a green circle of arrows. Don't touch it. It will reboot on its own.

18. After the reboot, you'll see some things you haven't seen by any other update method, including a barber pole progress bar and a dialog box that says "Checking for firmware update, please wait." (It shouldn't find one.)

19. When the home screen comes back up, you'll get a message box telling you "Your phone has been updated successfully to version 1.47.651.1."

20. You still have root and should have working WiMAX. :-)

You can delete the three files off your SD card if you wish.

If your 4G keeps scanning but never connects, you might be helped by this post.

Not originally by me..taken from another post...might help some people