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For completely bricked phones. You must short the "testpoint" on the motherboard to force the CPU into a vulnerable download mode. This is the "nuclear option."
Many "free download" links for these tools can be malicious. It is safer to use web-based calculators huawei unlock code calculator v3 fix download
Why people look for these tools
Supports some 4G models, though success may vary depending on the specific firmware version. Flash Codes: For completely bricked phones