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Article: HTC official bootloader unlock now supports the EVO View 4G & myTo
There's a difference with this unlock vs revolutionary. Some boot loaders however won't work with revolutionary, like an evo 3d with boot loader 1.5. They are forced to use this method, which unlocks the boot loader, but leaves the device with s-on.
Those folks can flash certain roms but can't (easily) flash kernels or radios. Check out revolutionary first if you have one of the devices listed. If your boot loader is supported then use it instead of HTC.