Hi,
ISP for this device isn't complete, the CLK pin is hidden inside, you have to use chip off methode to clear userlock using UFi eMMCToolBox, Userarea, Special Task, [Oppo] MasterClear.
You can follow this youtube video guide how to do such job.
https://www.youtube.com/watch?v=eWuiJT_MgcA
*credit to uploader