[Xoom General] KidJoe:
I wanted to share this story since I've seen many threads saying it was OK and "Easy" to convert your Verizon Xoom to Wifi only...

My Verizon Xoom (with 4G), MZ602, is only rooted, and running CWM, but otherwise stock and running IMM76L. I wanted to try the Jellybean wifi update, figuring I'd seen many "GEDify your XOOM" postings, I thought I'd try..

Before I began, I copied what data I needed from the internal storage space to my laptop. I then booted into CWM and did a backup, just in case, as I've read you can restore your CWM backup to get back to where you were...

I fastboot flashed the MZ604 files, erased cache, etc, and booted up. Everything seemed fine, so I connected wifi, and pulled the first OTA update. It installed, but when finished it rebooted. That is where things went totally wrong... My Xoom would hang at the red M dual core screen. While fastboot and RSD modes worked, recovery did not. When trying to enter recovery, it appeared as if it was going to go in, but hung with the last line on the screen saying ODM Fuse: 1. I tried reflashing the MZ604 ROMs, same thing. So I tried flashing back to the MZ602 roms. Again, the same. Using either the fastboot files, or RSDLite & SBF files available.

I spent over a day searching, reading, and trying things trying to get back to recovery figuring I could just restore the backup I made via CWM and be ok. But all of the threads I read about fixing the stuck at M screen wanted you to boot into recovery, which of course my XOOM would hang on. I found threads (including this one -> HERE) referencing flashing a 1.35-everest.reflash.sbf via RSDLite to fix it. I couldn't find a working link!! ( finally found -> HERE ).

That Everest SBF was the key to getting past hanging on the Red M/Dual Core screen. Once using it, I was able to flash CWM, so I tried restoring my backup, but did not have 3G/4G radio. MEID and IMEI were reported as "unknown".

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long story short... to get back working... including having the Xoom report the MEID, IMEI, Mobile Network info, 3G signal (not in a 4G area at the moment), on an MZ602 ROM I did the following...

1. used the fastboot files for HLK75D from Moto's site to flash my xoom.

2. Using RSDLite, flashed 1.35-everest.reflash.sbf (found -> HERE )

3. Follow P3's instructions at -> http://www.mydroidworld.com/topic/9179-motorola-xoom-322-recovery-images/#post106459

4. manually apply each OTA update via USB OTG cable. I booted between each update, skipped any setup, and went into settings to see if MEID/IMEI were still reported. I also did a factory reset between applying each update. NOTE: I imagine you can setup wifi and check for updates, but my xoom often reported "no update found" when trying to check via wifi)

I have not been able to confirm 3G/4G data works, as I do not subscribe to data for this device (and I haven't moved the SIM from my Thunderbolt over to the Xoom), BUT, at least the Xoom now reports MEID, IMEI, network as Verizon, and network type as eHRPD:13 as the network type.

[EDIT:] I have confirmed both 3G and 4G data are working today (Using the sim from my thunderbolt).[/EDIT]

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So, now I'm back to working IMM76L, stock, nothing on it, and I haven't rooted it yet... Because I'm in the process of moving, I can't do any more work on my Xoom until possibly tomorrow (if I get free time during the work day).

What I'd like to try, now that I've got IMM76L on it is...

1. flash CWM and restore my backup again and see if it works, and if I have 3G/4G data.

[EDIT:] This was successful, and I have 3G/4G data, and back to where I was before I started[/EDIT]

2. depending on #1, get adventurous enough to try flashing the MZ604 ROM, and try Jellybean, and if it gets stuck on the red M, flashing the everest sbf file.