If you are just locked out of the admin panel (not the SIM), use a factory reset: Locate the hole on the back of the router.
That said, following a well-written guide from the LTE forum hive mind, the flash took about 4 minutes. My heart rate? Much longer to recover. B311-221 Unlock Firmware
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: The most reliable and safe method. It involves purchasing or requesting a unique NCK (Network Control Key) based on the device's IMEI. If you are just locked out of the
Enter the solution: . This isn't just a software patch; it is a complete transformation that turns a restricted carrier router into a universal, open-line device. B311-221 Unlock Firmware