Huawei B683 Firmware Update 4g 2021 May 2026

The Huawei B683 is a 3G-only wireless router that cannot be upgraded to 4G LTE via firmware updates. While some online listings or queries may conflate it with 4G technology, its hardware is limited to HSPA+ (3.5G) with maximum theoretical download speeds of up to 28.8 Mbps.  Update Availability and 4G Compatibility 

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1. LTE Modem Firmware Upgrade: Updated the Quectel or HiSilicon baseband to support new band combinations (e.g., B3+B7, B1+B20), improving throughput in congested areas.
2. WebUI Hardening: Removed default “admin:admin” credentials requiring forced password change on first login—a basic but late-coming security hygiene measure.
3. VoLTE Support Enablement: Enabled voice calls over 4G without dropping to 3G, a feature previously absent or buggy.
4. SMS and USSD Fixes: Restored functionality of SMS over LTE and USSD codes (e.g., checking data balance), which had broken on some carrier networks.
5. Improved IP Passthrough Mode: Fixed DHCP lease issues when using the B683 solely as a modem connected to a separate high-performance router.

If the online update fails or you have a specific firmware file (like the one discussed on 4PDA ): How to Update HUAWEI B683 Firmware - 4G LTE Mall huawei b683 firmware update 4g 2021

1. Abstract

This paper outlines the technical requirements, procedures, and outcomes of updating the Huawei B683 residential gateway firmware to enable or stabilize 4G LTE connectivity. The Huawei B683, originally marketed as a 3G/HSPA+ device, received critical firmware updates in late 2020 and through 2021 to optimize LTE band reception and resolve compatibility issues arising from carrier network sunsetting of 3G services. This document details the upgrade path from generic firmware versions to carrier-specific or unlocked versions that support 4G throughput. The Huawei B683 is a 3G-only wireless router