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oppo a33f frp unlock with umt dongle. its a easy method. collect umt dongle. download latest umt Ultimate Multi Tool – QcFire setup. and install this setup your computer. and open it. select read & tools. select band generic qualcomm and modle select any modle. goto common functions click FORMAT FS. phone must be switch off and press volume plus and minus and connect phone with usb cable. then your phone frp unlock complete.