Never use Google Drive links from random blogs. Safe sources:
Not always. But some updates reset everything. Always backup. If you see “Clear NVRAM” ticked in the upgrade menu, it will wipe.
Golden rule: Never trust a firmware file that doesn’t come from a *.zte.com.cn domain or your ISP’s official domain.
A: ISPs often customize firmware with specific VLANs, QoS rules, and remote management scripts. A manual update from ZTE’s generic site might overwrite those, breaking your internet. Always use ISP-provided files.
Before proceeding, please read these precautions carefully to avoid damaging your router: