Hboot

Definition:
Hboot is most commonly known to the Android phone community as the first stage before the phone goes through its boot cycle.
In a boot control scenario, the hboot provides an avenue of choice between functions up to and including a standard boot. Other choices may be things such as recovery branch, or factory reset.
Hboot (aka: bootloader) also serves as a gatekeeper for software updates to the device. The hboot commonly uses encryption technology that will check to see if the package being written is "signed." This function is often referred to as "locked."
In any event, the hboot is a critical component. Without it, a device simply will not work.
Additional Resources:
 
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