[Request] Xiaomi Mi Gaming Laptop 2019 (Gen3) BIOS Advance Func Unlock

Spec:
CPU: i7-9750H, GPU: GTX 1660ti. Motherboard model: TM1806, BIOS date: 0806/2019.

Although I know that this model already outdated, but still I have some issue with this i7-9750H CPU, it seems PL1&2 were locked up, and I can’t find other reasons besides the BIOS Lock.
So do I need to request a help here, to modifiy my BIOS. Please tell me how or what should I do before attach files up and to do next. Most thanks!