[EVO 4G Q&A, Help & Troubleshooting] Gadget Man 007:
Maybe.

To explain I must start from the beginning.

Everything is working fine on 3.26. A week or so ago, I grabbed the 3.29 update and flashed it. Many of the other things I had flashed and had working on 3.26 were gone, such as Droid 2 keyboard, Smooth Sense, etc. I began reflashing all these things. Everything still worked fine (4G included). Then Thursday night I noticed that although the Samsung Fascinate wallpapers were applyable (they had worked fine before 3.29), they would FC immediately. I booted into recovery (at the time Clockwork) and flashed them. When the phone rebooted, everything immediately FCed as soon as I swiped to unlock. The phone was inoperable.

From there I wiped and reflashed 3.29 and all the other zips (excluding the Fascinate stuff). Everything appeared fine. Friday morning I had to turn the phone off for something. When I turned it back on, all my widgets (except for HTC ones) were displayed as broken. I thought maybe they hadn't loaded yet so I turned the screen off and waited a few minutes. When I checked again, all the widgets (save for HTC ones) were gone. I decided this was no big deal and I'd just reapply them. I then discovered although they weren't visible, their locations on the homescreens was still occupied even though nothing was there (couldn't delete because I couldn't see them). I then proceded to open "Scenes" and reapply an old Scene from before I had problems. This seemed to fix the homescreens and I continuted on with my day. A few hours later I noticed I wasn't on 4G even though I was in a place where I usually have full 4G signal. I toggled 4G on and off a few times to see if that would help. Nothing. So I thought to myself, "Self, maybe you need to reflash the radios since you needed to do that when applying the 3.26 update in early August." I went ahead and flashed the Wimax radio but still didn't connect to 4G. Later in the day I decided I'd try flashing the other radio, still nothing. That night I reflashed 3.29 thinking maybe something had previously gone wrong. I then had a bunch of issues trying to get BusyBox (via the app in the market) and could only get it to work through Titanium backup. Think that's the end of Friday. Oh, somewhere midday I tried the ADB stuff to check if my RSA keys were still intact, they were.

Saturday morning, I decide I need to get Amon Ra installed. I had previously been told to download Rom Manager and flash it through there (since it would be the easiest). I tried a few times and although Rom Manager said it was successful, every time I'd boot into recovery, I'd still have Clockwork. So I went about installing it manually. Then realized I needed to have NAND unlocked (thought I had done this months before but apparently not). I unlocked NAND and flashed Amon Ra 1.8. Next I flashed Warm TwoPointTwo instead of going back to rooted stock Sense. Right away I checked to make sure I still had RSA certs (I did), then made a Nandroid through Amon Ra to backup whatever keys I had. Anyway, went out to test 4G (don't have a signal at home), but still no luck. Downloaded the Busybox app and installed BB (didn't fail and crash the phone this time). Then flashed the latest radio all-in-one zip. Still no 4G. Double checked (again) Wimax info to make sure my keys weren't hosed using both methods in your post, everything seemed fine. Still no 4G.

Anyway, I too am in Houston but starting from that damn Samsung Fascinate LWP zip, I've been having problems. Guess I'm an official XDA-dev tester. Fun.