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A: Possibly. Some hardware revisions have a “dual boot” partition. Turn off, remove the SIM, insert a paperclip into reset, power on while holding reset for 30 seconds. The router may fall back to the secondary firmware partition. If not, your only hope is TFTP or a USB-to-TTL serial adapter (requires disassembly).
Because firmware is carrier-specific, the safest way to find a manual download is through your mobile provider’s official support website or the ZTE Support portal.
Look for a string like BD_MF283UV1.0.0B12 . The "B12" indicates the build number.
If the automatic check fails or you are offline, you can manually flash the firmware.
The 4G router communities at (Russian) or Huawei-MF.net maintain verified firmware collections. Only use if you can verify MD5/SHA256 hashes against official sources. Cross-check with multiple users before flashing.