[EVO 4G Q&A, Help & Troubleshooting] landaile:
First off, yes, I have used search and have read any thread where people said they could not get 4G to connect. I have used google to search for a solution as well. I am posting this with that hope that someone may have an insight and if I can resolve my issues hopefully others will be able to as well.

The Problem: My EVO will not connect to 4G service. It turns on, goes to scanning, connecting to sprint, authenticating to sprint, obtaining IP address, disconnecting, scanning, connecting to sprint, …

The History: I have always kept nandroids of pretty much everything I do on my EVO. I have nandroid backups from the first time I rooted my phone still hanging around. I have used nothing but AMon-Ra 1.8 and later recoveries and made sure that the wimax partition was backed up. The week before last my EVO connected fine with 4G. Last week Myn updated to RLS5 and naturally I ran out and updated it. Unfortunately I don’t have 4G coverage (or 3G or 1x for that matter) where I live so I didn’t notice that my 4G stopped working until I got to Salt Lake City. I figured it must be something to do with the Wimax towers in the area so I wrote it off. I have had that happen in various places that didn’t have official Wimax roll-out yet. When I got to Seattle it was still doing the same thing, that is when I started to get concerned. So I sat in a parking lot where I knew there was great 4G coverage (my laptop has a wimax radio in it so I could see the good coverage from Sprint) and proceeded to roll back to a version that I know worked. No good, still no 4G connection. That is when I started digging through everything I could find.

The Troubleshooting process: First thing I thought was that maybe I had whacked my MAC address. So I ran to XDA forums, checked out the post on how to check if my MAC is still good. MAC address reported by fastboot oem wimaxrmac is the same as the one under my battery. Maybe I whacked my keys? Again, ran to XDA forums and found that I can run ‘cat /dev/mtd/mtd0 | grep RSA’ and see if my keys are there. Sure enough ----BEGIN RSA PRIVATE KEY---- and ----END RSA PRIVATE KEY---- is there. OK, it doesn’t seem to be the keys, but lets check to see if the keys that are there belong to me and my EVO. So again, back to XDA. This time I find a post that shows how to extract the RSA key and the device certificate and then run an MD5 sum to see if they belong together. It also shows how to look at the cert to make sure it belongs to your evo. Sure enough md5 checks out and the cert has my mac in it in the proper places. OK, lets check on the tree.xml file. Sure enough it has the right mac. OK, delete it like the instructions say. Now, I restart 4g, it creates a new xml file, but doesn’t connect. That’s ok, the guide says it likely wont. I update profile/prl, reboot, turn on 4g and no go again. Lets do the profile and prl again just for good measure, same result. Hmm, look there is another way to do the profile update. ##data#, data profile, menu->restore. The phone reboots and runs through all the provisioning steps. Still the same results. Once more, back to xda forums. This time I find a post about checking your wimax partitions with wimax_mtd. Well, wimax_mtd thinks its all good too.

By this time I am really confused and figure maybe I can unroot and apply the RUU to dump it back to default config. Now my phone is unrooted and STILL doesn’t have 4G access. After rooting the phone again and going back to another sense based rom I ran a tail on the sequansd.log file, again found by xda / google searches. Here is where I have no idea what is supposed to happen. Here is the tail of the log file. http://pastebin.com/f2jL4MVF and here is a catlog from another attempt. http://pastebin.com/sZ2BiM9g

Here is where it gets odd to me. I changed my realm to clearwire by using ##data#, wimax, realm, clearwire-wmx.net, reboot. Sure enough it connects and gets redirected to the clear.com site. I ran a tail of the sequansd.log file and get basically the exact same things as I got when I ran the tail while on the sprintpcs.com realm. http://pastebin.com/0EU7Qh86

This is where I am stuck right now. Thanks for reading this far and sorry for the novel. Hopefully I gave enough information that this can get resolved and maybe it will help others.