If your console was on v9.00 before you updated to v10.50, that v9.00 image is still physically present in the inactive slot. Reverting forces the console to switch back to this backup. Prerequisites and Technical Requirements
It’s important to clarify upfront: . Sony’s firmware updates are designed to prevent rollbacks, and once the system’s efuses are blown (a one-time hardware change) during an update, lower firmware versions become incompatible. ps4 downgrade 10.50 to 9.00
Reverting a PlayStation 4 from firmware to 9.00 is not possible through standard software menus or USB updates alone. However, it can be achieved through a highly technical hardware process known as firmware reverting . The Core Concept: Slot Switching If your console was on v9
There is only one functional way to achieve this, known as . Method: Hardware Reverting (The Only Legit Way) Sony’s firmware updates are designed to prevent rollbacks,
Downgrading a Go to product viewer dialog for this item. from firmware 10.50 to 9.00 is . There is no "magic button" or official installer that can revert your system.