Re: HTC One M8 stuck in boot screen
Not an expert on rooting,but wouldn't that mean it has nothing to go to if you deleted the OS? If I'm not mistaken, this is called bricking you're device?
Posted via the Android Central App
No, it's not bricked. Bricking the device turns it into a literal paperweight - won't boot, won't turn on, won't do anything.
If you delete your OS, you install a custom recovery like TWRP and then move a new OS to your phone. Then you have to use the custom recovery to install the .zip file containing the OS. This can be done via ADB I think, but I'm not entirely sure about the process. I'm sure people at XDA would be able to help, though.