UPDATE 2020-10-11: Added Excellent APKGrabber ALTERNATIVE FIRMWARE As for firmware, I recommend to use LineAgeOS if your device is supported. Neat FW with minimal tracking and no bloat from big corps. If there is no native LineAgeOS support check XDA forum threads for unofficial ports by community enthusiasts. If your device is not supported in both cases I do not recommend to update stock firmware to prevent bloat’n’telemetry installation.