HTC Dumlock is a workaround for devices with HTC's unlock that cannot flash boot from recovery. Put simply, we make backups of recovery and boot, then we flash the backup of recovery to boot. When you reboot normally, you'll be in your recovery, but since your recovery is flashed to boot, you can make changes to boot. We've added some extra features to TWRP 2 to allow you to easily restore the backup of boot once you've booted your recovery with this method, OR you can use the installable zips with any recovery that you choose. Hit the link below for the details.
You can find more information and download links on our website!