Help. I bought a Redmi Pad 2 but I can't unlock the bootloader.

I didn't know Xiaomi blocked bootloader unlocking. I tried with MTKClient, but it requires authentication and a preloader, which I don't have, and I don't want to brick the device.

I'm looking for advice on how to unlock this tablet. Help!

CPUZ:

25040RP0AG taiko_global 
Modelo MT8781U (MT8781V/NA) 
Android Versión 15 HyperOS 2.0.203.0.VOVMIXM Build ID AP3A.240905.015.A2 
Kernel 5.10.226-android12

But name processor is "Helio G100-Ultra"