| Source | Trust level | Version example | |--------|-------------|------------------| | 4pda.to (Russian forum) | Medium (user) | B311s-220_Unlock_11.178.xx | | Huawei-Firmware.com | Low (outdated) | None specific | | DC-Unlocker "Write Firmware" | High (paid) | Custom unlock firmware | | Telegram groups (Huawei modem unlock) | Low/Virus risk | Many fake |

Firmware replacement (stock unlocked firmware)