Se Bootloader Unlocking Relocking 1662 Patched

When you relock a bootloader, the device verifies that every single partition matches the OEM's original signed image. If you have:

...the relock will trigger Anti-Rollback or AVB (Android Verified Boot) 2.0 failure. The device will not boot. It will display: "Your device is corrupt. It cannot be trusted."

Some YouTubers claim to patch the bootloader by downgrading to Android 11. This no longer works. The 1662 patch is burned into the xbl (Secondary Bootloader) and the aboot partition. Downgrading triggers Anti-Rollback Index (ARI) mismatch. The phone will shut down permanently. se bootloader unlocking relocking 1662 patched

The only reliable unlock method for 1662 devices is: Buying a device with a factory-unlocked bootloader (Pixels, Nothing Phones, or specific Xiaomi "Unlocked Edition" units).

Most Samsung devices use Odin, not fastboot.
In Odin: When you relock a bootloader, the device verifies

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).

In the context of Sony Xperia devices (particularly the XA2, XZ, and XZ2 series), the numbers 1632 and 1662 typically refer to specific firmware build numbers or Service Exchange (SE) firmware versions. Most Samsung devices use Odin , not fastboot

When users refer to a device being "1662 patched," they are usually referring to a security update that patched previous bootloader exploits (such as the "l exploit" or "loo exploit" used on devices with DRM issues).

The key distinction is:

Common workarounds (varies by model and Android version):

⚠️ None of these work on the latest Samsung security patches (2023+ for most models).