Do not interrupt power or close the tool until "Upgrade Successful" appears. The router will automatically reboot (Power LED solid). This takes up to 10 minutes. After reboot, perform a factory reset via the reset button (press 30 seconds) to clear any residual NVRAM settings.
While this tool is essential for "unbricking" a router, it carries significant risks:
The B593s-22 Multicast upgrade tool.exe is a proprietary Windows-based software utility developed by Huawei (and sometimes adapted by third-party firmware communities like OpenWrt or DC-Unlocker) to flash firmware onto Huawei B593s-22 routers using UDP multicast technology. Unlike typical web-interface upgrades (TFTP or HTTP), this tool operates at the bootloader level, making it invaluable for three primary scenarios: B593s-22 Multicast upgrade tool.exe
The file itself is usually a lightweight executable (under 2 MB) that, when launched, presents a minimalist interface with fields for server IP, multicast address, firmware file path, and device count. Despite its dated appearance (often resembling early-2000s network tools), it remains one of the most powerful methods for low-level flashing.
Even with correct steps, issues arise. Here are solutions for the most frequent errors when running B593s-22 Multicast upgrade tool.exe. Do not interrupt power or close the tool
| Error Message | Likely Cause | Fix |
|---------------|--------------|-----|
| Failed to create socket | No admin rights or firewall block | Run as admin; disable Windows Defender Firewall temporarily |
| No response from device | Wrong multicast IP or router not in download mode | Re-enter download mode; verify multicast IP from firmware notes |
| CRC mismatch after transfer | Faulty Ethernet cable or electrical noise | Replace cable; use shielded Cat5e or better; lower network speed to 100Mbps |
| Flash write error at offset 0x... | Firmware incompatible with hardware revision | Obtain correct firmware for B593s-22 v1/v2; do not force flash |
| Tool crashes on launch | Missing Visual C++ Redistributable | Install VC++ 2010-2022 x86/x64 from Microsoft |
If the router becomes completely unresponsive (all LEDs off except power), you will need a serial TTL adapter (3.3V logic) connected to the router’s J4 header to reflash via XMODEM. That procedure is beyond the scope of this guide but covered in depth on OpenWrt forums. The file itself is usually a lightweight executable
Do not change advanced options like Packet Size or TTL unless you are an experienced network engineer.