[EVO 4G Q&A, Help & Troubleshooting] sekigah84:
Common Problems:

Standard Troubleshooting For Many Flashing Problems:

-Try Rebooting. Most problem will be solved this way.

-Was it fine before your Nandroid Backup? If so, restore your backup.

-If you flashed something and are having issues, did you wipe your data/cache/dalvik? If not then do it and reflash.

-If you are still getting problems, the file is most likely corrupt or outdated. Try redownloading and making sure the file is updated for your ROM + Version #

-If the file is updated and NOT corrupt,

SEARCH FIRST IN THE FORUMS OR GOOGLE!

You will be surprised on the answers you can find in 15 seconds of searching.

-Can't find any solution or workaround? Then make a post in that thread with details of your problems, as well as ROM, Hardware version, Hboot #, error messages, etc.

I am getting a picture of an Evo with a Red ! inside of a triangle HALP!

You mean this?

This means your recovery is not flashed to a custom one such as Amon RA or Clockworks. If you do have one flashed, try hitting VOLUME UP and the POWER button. See if your screen pushes into recovery. If not then you will have to reflash your recovery again.

I am getting a picture of an Evo with a Green arrow with a circle HALP!

You mean this?

This means whatever you just flashed is being updated and you should let it run its course. It will go away after a few minutes and by the time you finish reading this it might be done! If its running for a LONG TIME. Pull your battery and load back into recovery. Wipe your data/cache/dalvik and then reboot again. You might see this screen again but it should run through this time.

I am getting a red ? image what does that mean?

You mean this?

The "WTF" (courtesy of xHausx) icon, it will show that if it gets a bad auto update command or a bad update package. Try to go back into recovery, wipe your data/cache/dalvik and try again.

I am getting a red triangle with an !

You mean this?

The Last one I'm guessing you'll see if there is an error within the recovery itself, I've never seen it be used before. - xHausx

I am getting random Force Closes (FCs) after flashing ****.

Did you wipe your data/cache/dalvik? If not do a Nandroid Restore to the backup you should have done before flashing and then wipe data/cache/dalvik and then reflash. See if you still get a FC. If you do, there might be a problem with whatever it is you flashed with the ROM you are using. Check on the thread you downloaded it from for support.

I am stuck in a boot loop.

If you flashed a new ROM and you are stuck in a bootloop, you probably didn't erase your data/cache/dalvik. Try that and reflash your ROM. This will fix most boot loop issues. If it was from something else, make a post in your respective threads or in Q+A.

I am stuck in a NAND Backup! Lots of "..............."

Pull your battery and restart the backup. You might also want to erase the NAND backup that failed by going to your respective NANDROID backup folder on your SD card.

My 4G isn't connecting and I'm in a 4G city.

Enable your 4G radio. Go to Menu > Settings > Wireless & Networks and look under 4G. If you see Scanning... > Connecting to Sprint > Authorizing > Scanning and it keeps repeating, you might have lost your RSA keys. Go back to your home screen, hit Menu > Settings > About phone > Hardware Information > 4G MAC Address. Does it say 00:16:08:00:24:05? If not you are fine and probably don't have a strong enough signal. 4G doesn't penetrate as well as 3G because there isn't that much signal saturation. Also because 4G runs on a higher frequency than 3G and therefore doesn't penetrate as well. (kudos to for reminding me nuformzdesign) If so, you lost your MAC address. Now you need to check if you have your RSA keys.

Go to the Market and download RSA Key Checker by joeykrim. Use this to see if you still have your RSA keys.

If you still have your RSA keys and only need to fix your MAC address IF it is 00:16:08:00:24:05. Go here:

http://xdaforums.com/showthread.php?t=715525

If you lost your RSA keys, there is a restore method but I am not sure if it works. At this point it is your only choice beside returning it to Sprint.

http://xdaforums.com/showthread.php?t=936945&highlight=RSA

OK. That didn't work. What do I need to do before I return this to Sprint?

Unroot your phone using the method above. Return it to Sprint, and tell them you can't connect to 4G and continue playing dumb. Say that you turned it off and turned it back on and no 4G. Also make sure you remove your SD card. If their tech is smart, he will look for signs of root like busybox or SU. So just keep it simple and take your SD card out and give them your phone.

I still have my RSA keys and my MAC address but I still can't connect to 4G.

Go to Menu > Settings > Update Phone > Update Profile. Also do Update PRL. Reboot your phone and try to connect again. If you can't go to Menu > Settings > Wireless & Networks. Look under 4G and see if it just gets stuck on Scanning and does NOTHING else. If it does, are you underclocking/undervolting? If so you might have been too aggressive. Revert back to a stock kernel. Check to see if you get your 4G back.

My 4G takes forever to connect. What can I do?

Take a look through this. What this does is basically make your phone check every 15 seconds instead of 300 seconds. Which is why your 4G takes forever to connect when you know you have a strong signal. Be warned however as this will cause your phone to die faster when 4G is on. Or you can update to 3.70.651.1. It has a "widget" that allows you to manually reconnect.

http://xdaforums.com/showthread.php?t=726877

My USB port/SD Card is not found or not working. What can I do?

Go through this post.

http://xdaforums.com/showthread.php?t=695243

Also this happened to me once because I unplugged in disk drive mode and I couldn't access anything on my SD card. I reconnected it to my PC in disk drive mode and then ejected the drive from Windows. This restored functionality.

I am a MAC user and I downloaded ____'s ROM and it doesn't work.

Macs will recompress the file. Use Firefox to download and make sure it doesn't recompress the file. It should work then. Either that or use a Windows based PC.

I tried to NANDROID BACKUP and I got an error message saying "Run 'nandroid-moble.sh' via adb!"

Your SD card is full. Mount your phone in recovery using the USB-MS option (Amon-RA) and clear off your SD card. Your Nandroid Backup folder is called nandroid (Amon-RA). Move that to your PC.

I see these weird multi-colored lines that look like static. Is something wrong?

This is a very common issue that happens to a lot of people. You don't need to worry. Nothing is wrong. Sometimes it will persist after you flash a ROM. Restarting your phone will fix the issue. It will always come up when flashing a ROM or restarting. However it won't impede you from using your phone. So the bottom line, don't worry about it.