This cannot be overstated. A firmware reset will erase all your custom configurations.
Complete Guide to Huawei E5172 Firmware Original: How to Restore & Update
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Usually yes, but only if the carrier firmware is not "anti-rollback" protected. Try downgrading via TFTP. If it fails with "version list check error," you cannot downgrade.
The progress bar will fill up, the router lights will flash, and it will automatically reboot. The process takes roughly 3 to 5 minutes. This cannot be overstated
Click and select the .bin or .zip file of the original firmware you downloaded.
If you need advanced features like band locking or cell tower monitoring, use the router's built-in engineering mode ( 192.168.8.1/html/index.html ) or external software like – without flashing third-party firmware. Try downgrading via TFTP
Before downloading any files, you must check the specific sub-model printed on the sticker underneath your router. Flashing firmware meant for a different sub-model can permanently brick your device.