Try a different USB cable or port (USB 2.0 is generally more stable than 3.0 for flashing).

Ensure your antivirus or Windows Defender hasn't quarantined the tool's components, as many service tools are flagged as "false positives." If you Are you trying to remove a lock or fix a bricked device ? Are you seeing a specific error code ?

Always start here to verify the CPU type and firmware version.

Most Spreadtrum devices require a specific key combination to enter : Power off the device completely.

If the file is in a .zip or .rar format, extract it using a tool like 7-Zip or WinRAR .

You must install the Spreadtrum/Unisoc USB Drivers so your computer can communicate with the phone in "DIAG" or "Boot" mode.

Re-insert the Hydra Dongle and ensure the Smart Card drivers are updated.

Go to the "Flash" tab, load your .pac firmware file, and click "Write" to reinstall the operating system.