Universal Secure Mobile Device Entry Upgrade Electronics Unit for Electronic Locks and Method of Use Thereof

A universal secure mobile device entry upgrade for electronic locks adds a wireless unlocking functionality to an existing host lock assembly. An electronics unit having a processing unit, a wireless communication device, a lock input, and a lock output is installed between a host motor output and host motor of a host lock. The original unlocking functionality of the host lock is maintained by either repeating an unlock signal from the host motor output to the host motor using the processing unit, or through a two-position switch that passes a host unlock signal to the host motor by default, but switches to a second position that allows an unlock signal to be sent to the host motor when a wireless unlocking is signaled from a mobile unlocking device such as a smartphone or the like. An integrated security chip and real-time clock may be included to increase security.