A couple of days ago, we told you about a mystery HTC device with a snazzy red stripe, spotted by someone with a very blurry camera.

Well it seems that one of Phandroid’s readers has done a bit of sleuthing around the web, and has uncovered some further evidence of a soon-to-be-announced HTC device — the photograph he found is shown above.

Given there’s an HTC media event coming up on 19 September, this seems to be a fairly likely subject of an announcement.

The forums on which this photo was found have been discussing the idea that this mysterious device could in fact be the HTC Endeavor C2 — otherwise known as the One X+. The One X+ is rumoured to be a beefed up version of the venerable One X, featuring more CPU grunt in the form of a 1.7GHz quad-core Nvidia Tegra 3 processor, and more RAM.

If its based on the One X, then its likely that this bit of speculation is right — existing One X accessories are expected to be compatible, with the only question remaining about whether HTC has squeezed some extra screen real estate in.