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Cybersecurity is one of the most difficult challenges posed by the revolutionary smart power system. Cyberattacks on power grids have already caused widespread, temporary outages via Phasor Measurement Unit (PMUs). When a PMU is hacked with a false data injection attack, it can lead to unexpected errors in state estimate variables such as buses voltage, buses angles and their magnitudes then cascade failures. Previous studies suggest deploying PMU is to operate secure Generation and Transmission lines on the power system utilizing a variety of approaches and strategies to maintain voltage stability or improve power transfer. This study utilized the Observability Redundancy to deploy PMUs at optimal locations along a network to ensure the grid's critical observability to eliminate false data injection vulnerability. The fundamental objective of this initiative is to strategically deploy PMUs to minimize the grid's susceptibility to a potential fake data injection cyberattack and to increase grid observability redundancy through a limited number of PMUs and use historical data for current data validation. Using the MATLAB platform, the results are compared to demonstrate the system's enhancement. On the IEEE 30 bus test system, the suggested scheme's usefulness has been proven through effective testing.