possible to downgrade OPPO A5 2020 CPH1931?

hello everyone, I have an OPPO A5 2020 chp 1931 with firmware version C82, the phone is locked by password, I wanted to reset but I can't, so I thought of removing it with flash via MSM FLASH but the latest versions I found and the C77, I wanted to know if I can put this version !!!!!!!!!