I don,t know firmware password

I bought this macbook pro since 2017 from man lived in Khubar in KSA

Unfortunately, I forget everything about him , his name or mobile number and he did not give me the bill

I need to update the system of my Macbook nessasery now ,,

When I try to enter the Recovery Mood, it asks me about Firmware Password !!

I don,t know it ..!!

please help me ..