OPPO may have an equivalent to Samsung's Exynos SoC line in the works. This is in line with a new report that the OEM has registered the name M1 in relation to this product category with the European Union Intellectual Property Office (EUIPO). This hardware could thus join or even replace Qualcomm silicon in future phones from this company.
https://www.notebookcheck.net/OPPO-trademarks-its-own-in-house-mobile-chipset-in-Europe.443878.0.html