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: While you specifically asked for v8.4.9, the software has since updated to v8.5.6 (as of mid-2022), which includes expanded support for Newer Huawei and ZTE models and "dead modem" repair capabilities without JTAG. Technical Capabilities of MKey
The search results indicate that "MKey" in this context likely refers to the MKey (Modem Unlock Key) USB Dongle
Troubleshooting common issues
