Multiple malware apps preinstalled on Infocus phone? topic

I bought Infocus M2 phone from Tinydeal. Infocus is not so well known brand and I am bit suspicious about chinese phones, I have used Lenovo phone quite some time now but I replaced its rom in the beginning, altough how can I be sure that the rom I have been using is totally pure? Well, I can't but I have used bank applications etc. without problems.

However, I first checked this Infocus phone with Avast which reported one PUP -rated app, related to updating the phones firmware. However, after running Malwarebytes it reports three malicious apps and none of them is the one Avast reported.

Apps cannot be uninstalled since this phone is not rooted and those are system apps. Should I stop using this phone? Nice device but...

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