First the phone looks very nice as to RAM and memory.
https://www.gsmarena.com/huawei_nova_2-8672.php shows 4GB RAM (ample!) and 64GB internal.
Since you did a factory reset my thoughts are you MUST use the Google Play Store and do this only on WiFi.
Currently using huawei nova 2i with emui 5.1 and everytime i try to download large apps error code 495 alway shows up. I tried clearing cache on play store and play service, tried force stop, uninstall updates, reset app preferences,usinv vpn even tried factory reset and yet error code 495 still shows up.
It only shows up on large apps and usually when im about 70%+ in to the download. Anyone know what im missing?