HTC has released a tool to unlock the bootloader in some of its Android devices, the company announced today. According to a posting on HTCDev, HTC will allow the bootloader to be unlocked on every phone it releases going forward, and will also be working backwards to make unlocking tools for phones released prior to September 2011.

HTC previously took pains to lock down the bootloaders on its Android devices, preventing users from rooting them to install custom operating system builds. After some backlash, HTC recanted, and Peter Chou, HTC's CEO, said in May that the company would no longer be locking the bootloaders. However, the ultimate outcome seems slightly different: the text of the HTCDev post reads "we will allow our bootloader to be unlocked for 2011 models going forward," suggesting phones may continue to be locked on release—but now, customers can unlock with the company's blessing.

Of course, "allowing" is different than "supporting." HTC warns customers that unlocking their devices may mean they're no longer covered under warranty. The company also notes that unlocking the devices may cause unintended side effects, including overheating.

Phones that support the unlocking tool currently including the HTC Amaze, EVO View 4G, Design, Flyer, myTouch 4G Slide, and the Sensation. According to Gigaom, several developers have discovered the tool also works on models including the Rezound, Vivid, Rhyme, and Thunderbolt.

This sounds like a great way to get an early install of Android 4 on HTC devices. Any takers?