Yes. Flashing with the "Format All + Download" option completely wipes the FRP partition. You will need to set up the phone as new.
You're looking for content related to the Oppo CPH1933 flash file. Here are some details: oppo cph1933 flash file
: Ensure your phone has at least 50% charge to prevent shutdown during the process . oppo cph1933 flash file
Flashing can bypass forgotten patterns, PINs, or passwords. oppo cph1933 flash file
What a Flash File Contains