I tried & followed all the steps which have mentioned under help & feedback. But there was no point. It seems to me that there’s a big problem. But I don’t know what it is. Further when download failed, finally I got notifications with Error codes: 905, 495,..etc. Could you please tell me what should I do now for fix this problem as soon as possible?
Welcome in Google Play Community.
Follow the help article about the Play Store won’t open, load, or download apps.
If that didn’t fix the issue try this article: More steps to fix problems on google play.
If the Factory Data reset didn’t work, you should contact the device support.