B622-335 Firmware Page

: If a new version is available, follow the on-screen prompts to download and install it. Troubleshooting & Manual Updates Huawei B622-335 | 4G+ modem Router Review (Soyealink)

The firmware includes a "Carrier Lock" mechanism that whitelists specific MCC (Mobile Country Codes) and MNC (Mobile Network Codes). If a SIM card from an unauthorized carrier is inserted, the firmware initiates a connection refusal at the modem level. B622-335 Firmware