If the software remains permanently stuck trying to establish a link, your microcontroller's internal bootloader has been erased. Software tools cannot fix a device in this state because there is no firmware left on the chip to handle the incoming USB instructions.
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Many car enthusiasts use aftermarket hardware clones. These clone interfaces frequently become unstable or "bricked" when users attempt to flash incompatible firmware versions (such as forcing a downgrade from version 1.99 to 1.45). When this happens: The computer registers a "bootloader not found" error. The device manager may show an unknown USB device.