Jun 08, 2020 · Note: This method can brick your device if it does not match with the firmware so the first backup your data and download the stock firmware and start the process. 1. First, read Pre-requisites and Enable Developer Options, USB Debugging and OEM Unlock. 2. Download and unzip Vivo EDL unlock Tool and go to the next step. 3. Practice and homework lesson 5.1 answer key 4th grade