For those of you purchasing the HTC One Developer Edition (64GB unlocked model) from HTC, you'll be happy to know that the factory image is now just a download away. HTC has posted the 1.29.1540.3 factory image for the device. It's available on the HTCDev site. HTC has made it available in two different file types. There's a zip file and a Windows RUU executable file, which makes it easy for all of us, no matter what OS your computer is running.
These files from HTC will allow you to restore your phone back to a "brand new" like condition. It'll be like the day you bought your HTC One. But this is as long as you have access to the Bootloader. This basically means, whatever you've done to your device, you can easily bring your device back to stock.
It's great that HTC made the Factory Image available in two flavors because those of us that don't want to use Fastboot can run the RUU and let it do all the work. Those of us not using Windows (i.e. using Mac or Linux) can use the zip file and Fastboot to go back to stock.
It's important that we mention that these images are for the unlocked Developer Edition either. So don't try to use it on the Sprint, AT&T, or T-Mobile version of the HTC One. We also recommend that everyone go ahead and grab the image from HTC's website so just in case you need to use it, you have it available for use. The file is aboit 980MB in size and is available in the source link below.
How many of you have already rooted and unlocked your HTC One? Have you installed any custom ROMs on it yet? Let us know in the comments down below.
Source: HTC Dev