Flashing (e.g., LineageOS) or kernels that do not pass Samsung's official verification.
Your (found under the battery or in settings) samsung s5 set warranty bit kernel
If you own a Samsung Galaxy S5 and have recently rooted it or installed a custom ROM, you may have seen a scary-looking message in red text at the top left of your screen during boot: Flashing (e
Wait 3-5 minutes. The phone will reboot. The yellow "SET WARRANTY BIT : KERNEL" text will on the boot screen, but the phone should now boot normally into Android. The yellow "SET WARRANTY BIT : KERNEL" text
(like a custom ROM or root). This message is part of Samsung's Knox security system
No (not on the S5). Long answer: This is a hardware-level eFuse (one-time programmable). Once tripped to 0x1 , it cannot be reset back to 0x0 . Even if you re-flash the official Samsung firmware using Odin, the boot screen message will remain. The only way to hide it is to flash a custom boot logo or ignore it.