If you’ve got an HTC Amaze 4G on T-Mobile, it’s your lucky day: the official update to Ice Cream Sandwich has found its way online. There’s been no word from T-Mobile on when to expect an over-the-air upgrade, but adventurous types can download it from this XDA thread right now. The official ROM was posted by XDA user Football, without context or information. Go get it now – Who said Mondays have to suck?

The update is a whopping 486 megabytes, but that’s not so shocking considering that HTC’s official ROMs have been getting more and more huge with additions to basic features and Sense. Speaking of Sense, the version included in this update is 3.6, not 4.0 like the new One series phones. We don’t have an Amaze 4G handy to test, but that’s the way it’s been with the HTC Rezound leak and the Vivid update.

Those of you who are rooted and have a stock recovery know what to do – and those of you  who aren’t can still join in the fun. Since this is an official ROM (even though it’s been apprehended by less than official sources) you can just load it onto the root of your SD card and apply the update in stock recovery. Check the XDA thread for more precise instructions. There just one bummer: flashing the stock Ice Cream Sandwich ROM loses your root access. But no worries – the XDA folks have already found and supplied a new method. If you’re already rooted, remember to make a Nandroid backup first!

[device id=1659]

[via Android Police]