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This is almost always a driver issue. Ensure you disabled Windows driver signature enforcement and re-install the package from the C:\Flashtool\drivers folder. Alternatively, try switching from a USB 3.0 port to a USB 2.0 port.

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Simple integration for installing custom recoveries (like TWRP) or pushing root binaries to compatible firmware versions. This is almost always a driver issue

Yes, but strictly for Legacy Devices .