ZTE maintains a partner portal at support.zte.com.cn but access requires an authorized partner login (ISP or distributor). End-users cannot access it.
Due to strict licensing and telecom regulations, ZTE does not host public, direct download links for end-user ONT firmware. You can safely acquire the files through three primary channels: 1. Your Internet Service Provider (ISP) Support Portal This is the safest and most reliable method. Log into your ISP account dashboard. zte zxhn f670l epon firmware link
Once you have obtained a valid firmware file (usually a .bin or .trx file), follow this procedure: ZTE maintains a partner portal at support