A hard reset, which is also known as a factory reset, is a procedure that wipes all data and settings and restores a device to its original state. The legality of using a hard reset trigger is dependent on the circumstances surrounding its usage.

As a general rule, performing a hard reset to return a device to its original state is legal. For instance, if someone buys a used phone and wants to erase all data and settings before using it, a hard reset is legal.
However, using a hard reset to bypass security measures or obtain unauthorized access to a device is illegal. For example, if someone steals a phone and uses a hard reset to delete the owner’s data and settings, it’s an illegal activity.
In some instances, the legality of a hard reset may be determined by the laws of the jurisdiction in which it happens. For instance, in the United States, the Computer Fraud and Abuse Act (CFAA) makes it illegal to intentionally access a computer without authorization. Thus, if a hard reset is used to bypass security measures or obtain unauthorized access to a device, it may potentially breach the CFAA.
Furthermore, the use of hard reset triggers by law enforcement or government agencies may be subject to legal scrutiny. In some cases, law enforcement officers may use hard reset triggers to obtain access to encrypted devices or bypass security measures to gather evidence. However, the legality of this practice may depend on the specific circumstances of the case and the laws of the jurisdiction in which it occurs.
It’s also important to keep in mind that using hard reset triggers may have ethical implications. For instance, if law enforcement officers use a hard reset trigger to gain access to a device without a warrant or probable cause, it may infringe on the individual’s privacy rights.
All in all, the legality of using a hard reset trigger hinges on the context in which it is used. Generally, if a hard reset is used to restore a device to its original state or as part of a legitimate security protocol, it’s legal. However, if a hard reset is used to obtain unauthorized access to a device or bypass security measures, it may be illegal and subject to legal scrutiny.