Se Bootloader Unlocking Relocking 1662 Patched May 2026

Most Samsung devices use Odin, not fastboot.
In Odin:

If your device is truly “1662 patched,” the above may fail. In that case, you may need to downgrade to an older bootloader version (not possible if anti-rollback is enabled).

Short answer: Usually no, unless you have a factory flash image from the exact build you’re on—and even then, it’s a gamble. se bootloader unlocking relocking 1662 patched

If you try to run fastboot oem lock on a device where the 1662 exploit was used to unlock, you’ll often get:

FAILED (remote: 'token verify failed, 1662 patched')

or simply a bootloop after relocking, because the bootloader now sees the custom images as invalid. Most Samsung devices use Odin , not fastboot

The only safe way to relock after a patched SE unlock is to fully restore the device to 100% stock firmware, including:

Then, and only then, can you run fastboot oem lock (or the device-specific command). But if the 1662 patch was applied via a firmware update, the exploit chain is broken—and any attempt to relock may permanently disable the device. If your device is truly “1662 patched,” the

If you have a device that isn't patched yet, or you are buying a new phone, here is how to navigate the SE bootloader landscape without triggering the 1662 curse.