: For many SE models, if you successfully unlocked before the 1662 patch, you may still be able to operate with a custom recovery. However, attempting to relock under the new patch often results in a "Red" integrity state, preventing the device from booting entirely or permanently disabling OTA updates .

For modern Xperia or legacy Sony Ericsson users facing this patch:

Relocking is often necessary to restore warranty or pass integrity checks (though on some older SE devices, a "relocked" status is different from "locked" and may still trip certain flags). Unlock bootloader allowed : No,Needa fix here! - Sony

Buying a device with a factory-unlocked bootloader (Pixels, Nothing Phones, or specific Xiaomi "Unlocked Edition" units).