Some OPPO F11 models have an for authorized service centers. You may find leaked versions on XDA Forums.
Troubleshooting Your OPPO F11: A Complete Guide to Fixing Recovery Mode oppo f11 recovery fix file free
[FREE] OPPO F11 Recovery Fix File - Solve Hang Logo & Dead Boot (Tested) Some OPPO F11 models have an for authorized service centers
: Install the MediaTek USB drivers on your PC. Extract the firmware and flash tool archives Bypass Authentication MTK Auth Bypass Tool Disable Auth Turn off your Volume Up + Volume Down oppo f11 recovery fix file free