Typically flashed as a .zip file using a custom recovery environment (like TWRP ) immediately after installing the recovery itself.
In TWRP, go to Settings and disable Enable signature verification for this flash. The open-source script is not signed with an official key. Multidisabler-samsung-3.1.zip
To understand , you must first understand Samsung’s defense system. Since the Android 9 (Pie) and Android 10 (Q) eras, Samsung introduced VaultKeeper and fully enforced dm-verity (device-mapper verity). These features check the integrity of system partitions. If the system detects any modification (like an unofficial recovery or root), it either refuses to boot or throws the infamous "Only official released binaries are allowed to be flashed" error. Typically flashed as a