It might not be “designed for humans” and it doesn’t come from the most popular and successful Android manufacturer of the moment, but the HTC One X is one heck of a phone and some even consider it the greatest out there.

There was, however, one thing missing to make the One X truly amazing, and that was a custom ROM to tickle the imagination of amateur (and professional) rooters. Less than a week ago, we found out that the phone’s bootloader was finally unlocked, so it was only a matter of time until we could flash some tweaked software goodness on HTC’s flagship.

Modaco forum’s “TripNRaVer” user is officially the first dev to crack the One X’ software and build a custom ROM designed especially for the phone. He only needed five days to get the job done. That’s truly impressive, if you ask me, especially considering the fact that, based on initial user feedback, TripNRaVer’s firmware works pretty smooth.

The custom ROM is based on CyanogenMod 9, so there’ll be absolutely no trace of HTC’s Sense UI on your phone once you flash it. That’s very good news for anyone who loves the “pure” Google experience, but, unfortunately there are some things that are not that great about this build.

First of all, the ROM only works on the international version of the One X, the one powered by NVIDIA’s Tegra 3 quad-core processor. The 4G LTE model, sold by AT&T in the US and Rogers in Canada, and featuring a Snapdragon S4 chipset, is not supported by this software build, so don’t even bother trying to install it!

As far as bugs and glitches go, WiFi tethering is the only major feature reported as not working right now, but that could change with a future update. Other than that, you shouldn’t experience unexpected issues with the software, but then again, you might want to browse through the entire thread on the Modaco forum and make sure. You should also know that, while the ROM is based on CyanogenMod 9, this is not an official release from the CM team.

Full installation instructions are available at the same thread  and the flashing process is described as easy by most users who’ve dipped into it. Then again, you should keep in mind that, once you flash a custom ROM on the HTC One X, you can bid adieu to your warranty, so handle with care and think things through before doing something that you might end up regretting!

That being said, have fun and don’t forget to drop us a line in the comments section below and tell us how the ROM feels and looks! Is it better, more functional, and smoother than the out of the box experience provided by ICS and HTC Sense 4.0?