I had this old Greentel smartphone which has an internal memory of 8GB. I did not use it for a like year now. But it is working just fine even now after a full charge. When I put it away it only had a few MB available. But the problem is that internal memory could not be deleted or anything. Whenever I delete it says its deleted but yet its there again. And the other matter is it does not recognize by my PC. I do not see any option other than format it entirely. Do you guys happen to know any solution for this?