The new bootloader checks a monotonic counter stored in write-once memory. If an attacker attempts to flash firmware older than version 2.2.0, the module enters a "bricked recovery mode" requiring physical intervention. This closes the downgrade attack vector.
Key fixes and improvements
Never power off the device during the process. An update can take anywhere from 10 to 30 minutes depending on the connection speed and file size. k82083w firmware update patched