Running outdated firmware on your H122-373 can lead to slower speeds, dropped connections, and potential security vulnerabilities.

Yet, the signal was there.

| Action | Risk Level | Reason | |--------|------------|--------| | Changing band locking via AT commands | Medium | Can be reverted; no permanent flash write | | Flashing OpenWrt / custom firmware | Extreme | No open-source drivers for Balong 5000 exist. Doing so destroys modem calibration data. | | Using “unlocked” firmware from unofficial Telegram groups | High | Often contain backdoors, wrong partition maps → dead device |