Hello! I'm sorry to hear about the issue with your Redmi Note 9S. If you're encountering a "System has been destroyed" message and need to unlock the bootloader to fix it, here are some steps you can follow:
1. Request Unlocking Permission: Xiaomi requires users to request permission to unlock the bootloader. You can do this by visiting the Xiaomi Mi Unlock tool website and following the instructions to apply for unlocking permission.
2. Unlock the Bootloader: Once you receive permission, you can proceed to unlock the bootloader by using the Mi Unlock tool provided by Xiaomi. Make sure to back up all your data as unlocking the bootloader will erase everything on your device.
3. Flash the ROM using MiFlash Tool: After successfully unlocking the bootloader, you can use the MiFlash Tool to flash the stock ROM on your Redmi Note 9S. This should help resolve the "System has been destroyed" issue.
4. Follow Tutorials: It's important to carefully follow the instructions provided by Xiaomi on their official website or forums when unlocking the bootloader and flashing the ROM. There are also many tutorial videos available online that can guide you through the process step by step.
Remember that unlocking the bootloader and flashing the ROM can void your warranty and may have risks if not done correctly. If you're not comfortable with these steps, it might be a good idea to seek assistance from a professional or contact Xiaomi customer support for further help. Good luck with fixing your Redmi Note 9S!