Samsung's security protocols prevent users from "downgrading" to a lower binary version. If your phone is already on Binary 8, you cannot install U7 or lower firmware without causing a flash failure.
Restoring a phone that won't turn on or past the logo.
Users download the full 4-file firmware (BL, AP, CP, and CSC) and install Samsung USB Drivers.
remains a popular budget choice in various global markets, and keeping its firmware updated to the correct binary level ensures the device continues to function securely.