The progress bar will turn yellow as the flashing begins. Wait for a or "Download OK" message to appear. Important Post-Flash Tips
Take the device to an authorized service center or experienced technician. oppo a11k flash file repairmymobile
Modern Oppo devices have secure boot (SLA/DAA) that prevents flashing unless you bypass the authentication using a tool like MTK Auth Bypass Tool Flashing Procedure Extract Firmware: OFP Extractor to convert the official firmware into a folder containing the Android Scatter file Bypass Authentication: MTK Auth Bypass Tool and click "Disable Auth". Turn off your completely Volume Up + Volume Down and connect the phone to your PC via USB. Setup SP Flash Tool: flash_tool.exe Scatter-loading File section, browse and select the MT6765_Android_scatter.txt file from your extracted firmware folder. The progress bar will turn yellow as the flashing begins