[Q] Cannot update HTC Titan to Windows Phone 7.8 - HTC Titan

Hello-
I am trying to update my HTC Titan from Windows Phone 7.5 to 7.8 and am receiving error code 8007013.
The only method for updating I have attempted is using the SevenEighter tool from http://windowsphonehacker.com/articles/want_windows_phone_7.8_now_try_this_easy_tool-01-31-13
I have performed a factory reset and still receive the error when attempting to update.
I have found mentions of the issue in this thread, but did not find a resolution: [CAB] Official WP7 Updates List up to WP 7.8 + ALL LANGUAGES complete + OEM updates http://forum.xda-developers.com/showthread.php?t=1306415
The problem is referenced in this thread: [SOLVED] 80070013 error while updating to 7740 http://forum.xda-developers.com/showthread.php?t=1435745 however, the solution is apparently found at http://forum.xda-developers.com/showthread.php?t=1334468, which does not exist.
I have found an archive for thread 1334468 via the Wayback Machine: [ROM]Eternity Shipped ROM Collection http://web.archive.org/web/20111124033746/http://forum.xda-developers.com/showthread.php?t=1334468 however:
1.) I do not understand the instructions located in this thread.
2.) As the thread has been deleted, so have the attachments.
3.) The referenced attachments are apparently only for European handsets. Mine is from the United States.
I do not appear able to get past this on my own, and would appreciate any help from the community. Thank you.

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Log entries for most recent attempt
UpdateWP.exe Information: 0 : 3/9/2014 12:26:04 PM: Device Manager Initializing
UpdateWP.exe Information: 0 : 3/9/2014 12:26:04 PM: Device Manager Initialized
UpdateWP.exe Information: 0 : zune-tuner://windowsphone/2ead28ff%20-%207a54c5d5%20-%20961a12ae%20-%20937d942b
UpdateWP.exe Information: 0 : 3/9/2014 12:26:05 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Downloading updates 0%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Transferring updates 23%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Transferring updates 47%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Transferring updates 70%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Transferring updates 94%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Transferring updates 100%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:07 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Preparing to install 0%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:09 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Restarting your phone 0%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:09 PM: Waiting for reboot
UpdateWP.exe Information: 0 : 3/9/2014 12:26:15 PM: Device Removal: 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b
UpdateWP.exe Information: 0 : 3/9/2014 12:26:15 PM: Receive Removal Event!
UpdateWP.exe Information: 0 : 3/9/2014 12:26:30 PM: Device Arrival: 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b
UpdateWP.exe Information: 0 : 3/9/2014 12:26:30 PM: Receive Arrival Event!
UpdateWP.exe Information: 0 : zune-tuner://windowsphone/2ead28ff%20-%207a54c5d5%20-%20961a12ae%20-%20937d942b
UpdateWP.exe Information: 0 : 3/9/2014 12:26:32 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Executing Installing updates 0%
UpdateWP.exe Information: 0 : 3/9/2014 12:26:38 PM: Device 2ead28ff - 7a54c5d5 - 961a12ae - 937d942b Update Error 80070013 An unexpected error has occurred.%

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More information
Here is another thread which states the problem is solved:
(SOLVED) Error 80070013 when installing update? Check your serial number http://forum.xda-developers.com/showthread.php?t=1481445
However, the solutions appear to be dependent on http://www.htc.com/www/help/htc-titan/#download, which does not work, and, once again, thread 1334468, which does not exist.
It appears what I need to be able to do is "flash Eternity_Cingular_US_1.10.502.04_Radio_16.23.02.2 6 _A_16.27.00.23_Signed_ETERNITY_RELEASE.nbh" however I do not know how to do this, and do not know where I can get this file.

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Found the file from HTC
I found the patch from HTC by viewing the page source of an archived page:
dl4.htc.com/managed-assets/support/software/rom-code/htc-titan-zune-RUU/spl_2.6.160015.3_WWE.exe
I have also found the following instructions:
<strong>Release Date: </strong>2012-05-04
<p>This update for HTC TITAN will let your phone to be successfully upgraded via Zune. (Microsoft Zune Error Code: 80070013 / 8007000F)</p>
<h4>Requirements:</h4>
<br /> <ol>
<li> PC installed with Zune</li>
<li> Battery Capacity: At least 35%</li>
<li> OS Version: 7720 (7.10.7720.68) or later version</li>
</ol><br />
<h4>Installation Instructions:</h4>
<br /><br /> Follow the instructions below to download and install the update on your phone:<br /><br /> <ol>
<li>From your phone device:<br />    (a). With the phone turned off, press and hold the VOLUME DOWN and VOLUME UP buttons, and then briefly press the POWER button.<br />    (b). Release the VOLUME DOWN and VOLUME UP button after you see the white screen with "security" on left-upper corner.</li>
<br />
<li>Use the USB cable to connect your phone with computer, You will see "USB" shown on screen of the phone. </li>
<br />
<li>From your computer:<br />    (a). Click Download which is located at the bottom of this page to download this update (spl_2.6.160015.3_xxx.exe) onto your computer.<br />    (b). Start the software update by executing the download file (spl_2.6.160015.3_xxx.exe), and follow the on-screen instructions.</li>
I will attempt this and report the results.

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Success
All updates have been successful. The phone had been running 7.10.7740, essentially the original Mango release from September 2011. No update available from Zune, no update available from AT&T. Ridiculous. There were so many updates pending the whole process took 40 minutes.
Huge thanks to everyone who contributed to the threads and tools I used to finally crack this nut.
Hopefully this thread will help other stragglers such as myself.

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successful Titan II WP 7.8 load
Just wanted to chime in and report a successful update. I followed the procedure at Windows Central http://forums.windowscentral.com/htc-titan-ii/214875-2.htm "ATT Titan II updated to 7.8." This process uses the Seven-Eighter update tool, which even worked through a Parallels virtual machine. Just follow the steps and voila!
I had tried the cab moving method, and that only gave me a set of errors, regardless of what I tried to do. I also tried the "trick Zune" method of quick disconnect of the network connection with no dice. With the Seven-Eighter update tool, it worked as advertised after two false starts, one where the connection timed out (due to Parallels asking me "which OS do you want to connect this device to"). Six updates loaded onto my phone...