You can try to find what you need by searching in the internet archive wayback machine, if you're lucky the download you need will be archived here's a link to get you in the ballpark: https://web.archive.org/web/2011*/www.mi...
Adrian ok, I won't be lazy.. . But all you needed to do was search the archive until you found this link
https://web.archive.org/web/201012212238...
Instructions. Are here
http://www.mitsubishi-tv.com/3Dupgrade_i...
New operating instructions are here
https://web.archive.org/web/201105211435...
I WAS too lazy to keep searching for a later upgrade, if any...
Anyone else with the same problem but different model
(WD-60738, WD-65738, WD-73738, WD-82738, WD-65838, WD-73838, WD-82838 only)
go here instead
http://www.mitsubishi-tv.com/3Dupgrade.h...
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https://www.mitsubishi-tv.com/contact-us...
Try contacting Mitsubishi's customer support. If that TV has an available update, it's possible that they will provide it.
crwdns2934271:0crwdnd2934271:0 Funk Addict crwdne2934271:0
Thanks Funk gave it a shot but they have no idea how to help. They have not had access to any firmware or support to their TV's for a decade, even the 4 TV Mitsubishi certified repair shop numbers they gave me were all disconnected.
crwdns2934271:0crwdnd2934271:0 Adrian Freelancer crwdne2934271:0