I've attempted various methods: sideload 211 while rooted in GB 181 (flash from cache); also using Matt's utility 1.6 to restore to 6.12.181, (root, and unroot as needed) and then then pull down the update with the phone; Matt's utility 1.7 to "pre-pare for "side-load", AND I've even used RSD Lite to flash a stock 181. I actually understand what's going on with the various methods, BUT they ultimately ALL fail when "applying update" in recovery from either external storage OR from cache. Yes, I've 'wiped data/factory reset' and 'wipe cache' partition at all the right times, multiple times, etc. The bootloader is 0a6c, and I have seen both recoveries (cereal box, and droid on it's side w/ triangle). The current recovery is droid w/ triangle. I think that's the ICS recovery left over from a failed upgrade attempt. And, the phone runs just fine (missing 4g) with what appears to be a stock image of 2.3.6; when rooted or unrooted.
The failure always occurs when "applying update", from either external storage or from cache, as
...
updating LTE ...
assert failed: motorola.motoflash("/tmp/lte.img")
E:Error in /tmp/sideload/package.zip
(Status 7)
Installation aborted.
This phone may have been rooted previously, using who knows what method, and who knows what might have been done while root. Yes, I can successfully root AND unroot 2.3.6 using Utility 1.6 as needed. If something is "stuck" or "missing", it is NOT fixed by either a fastboot load of stock 181 OR RDS Lite of the same; or rooting and unrooting. And, yes, I'm checking the MD5 on all files used, both on the phone and when I transfer them to/from the PC. I don't believe I've encountered any corrupt file issues along the way.
* I've been using fastboot to manually flash radio images extracted from various builds. Long before I ever started this process, the phone lost LTE / 4g. Perhaps that happened when the first pushed OTA failed months ago... June? It hasn't had 4g for months. I only see one version reported in the baseband, always the CDMA version. Recently it was CDMA_N_05.11.01P. After the most recent radio flash attempt, it's now reporting CDMA_N_04.07.01R. It continues to work fine in 3g. (And, yes, I've tried flashing the radio image two or more times in each radio flashing session.)
* Attempting to diagnose the problem, I've pulled a few lines from the "update_radio.zip.failure" file which appeared in /sdcard (or /sdcard-ext). This shows a successful flash of BP, but then a failure in flashing LTE! It looks like the flash never came back after an attempt to "Rebooting LTE in Flash Mode". I believe the assert is failing not because of a problem with the file, but because the flash can't be accessed.
...
Formatting of Cache is required
Reading input Flash image....
Registering bp flash device
Registering lte flash device
Searching for flash devices...
Found Flash MZ600
Checking if flash device is available...
Open Flash Device...
Open serial flash device /dev/ttyUSB0
Sending RDL to flash device length:328792
Jumping to RDL at 800000Searching for flash devices....
Found Flash MZ600
Checking if flash device is available...
Open serial flash device /dev/ttyUSB1
Flashing codegroup 2, addr 0, length 25539712
Completed flashing codegroup 2
Flashing BP Complete
Reading input Flash image....
Registering bp flash device
Registering lte flash device
Rebooting LTE in Flash Mode
Searching for flash devices...
Unable to find flash devices
Retry flashing
Searching for flash devices...
Unable to find flash devices
Retry flashing
Searching for flash devices...
Unable to find flash devices
Retry flashing
script aborted: assert failed: motorola.motoflash("/tmp/lte.img")
assert failed: motorola.motoflash("/tmp/lte.img")
E:Error in /cache/update_radio.zip
(Status 7)
Installation aborted.
Radio Image Update failed.
...
(File attached below.)
It's annoying that it doesn't have 4g AND I can't upgrade to ICS. I've done quite a bit of searching on these topics and failures. Many resolve the problem with a new phone. :-( I'd be happy to just regain 4g in GB 2.3.6. ;-) But at this point, it has also become an educational opportunity. Any help and advice appreciated. Thanks in advance!