The progress bar moved slower than molasses. 15%... 32%... 67%... My phone got warm. The screen flickered. For ten agonizing minutes, the F3 looked like a brick. A black screen with only a spinning blue gear.
If the phone takes more than 10 minutes to start, perform a "Wipe Data" in Recovery Mode (Note: This will erase your phone's data). Oppo F3 Update Android Nougat 7.1.1
: Many users were left waiting for an update that never arrived through their phone’s built-in system settings. In regions like The progress bar moved slower than molasses