What role can mainly update Read-Only custom fields?

The role of System Administrator is primarily responsible for managing the overall configuration and settings within a system, including custom fields. This role has the necessary permissions to make changes, including updates, to fields that are otherwise designated as Read-Only. Read-Only custom fields are typically set to prevent unauthorized modifications to ensure data integrity, but a System Administrator possesses the authority to override this limitation when required. As such, this role is equipped with the necessary privileges to update these fields, facilitating system management and compliance with data governance policies. Other roles, such as HR Manager, End User, and Data Entry Clerk, typically have limited access rights and would not have the capability to modify Read-Only fields, keeping the integrity of the design intact.