| Source | Reliability | Notes | |--------|-------------|-------| | | Highest | Most ISPs host firmware for CPE they provided. | | Huawei’s enterprise support (contract required) | High | Only if you have a direct support agreement. | | Archived ISP technical bulletins | Medium | Some ISPs publish firmware via FTP or knowledge base. | | Reputable networking forums (DSLReports, BroadbandReports) | Low-Medium | Can be useful if hashed/checksummed files are verified. | | Random file hosts (4shared, Uploaded, etc.) | Dangerous | Avoid unless you can cryptographically verify the image. |