Xiaomi Redmi Note 9 (Merlin) Bootloader unlock successfully done by Hydra Tool
1. Run Hydra MTK Module and choose "Sosc"
2. Select Brand and Model as "Auto"
3. Sekect "Auto Broom Exploit", "Enable UBL Loader" and "Enable PrelDUMP"
4. Go to Service-->Xiaoami
5. Choose "Bootloader" from drop down menu
6. Execute and connect the device to the computer with data cable
7. wait until the process is completed.
Screen Short:
BR
Mount Everest