Recommendation: keep this 2017 budget handset for basic daily tasks only (calls, messaging, light browsing). For banking, frequent app installs or long-term security, either replace the phone with one running mobile platform 11 or newer, or install a community-maintained custom firmware that receives regular security patches. Software baseline: factory firmware is 7.1.2 (Nougat) with the vendor skin ColorOS 3.1. The manufacturer issued an official incremental upgrade to 8.1 (Oreo) in select mar...