Hello guys! I'm in dire need of help. I've tried countless times to download applications with my phone since yesterday, but it hasn't worked. All it does it that, when it starts downloading, on reaching 100%, it says ''invalid update", this is very unsual as i've download similar apps with this same phone before. I tried downloading opera mini browser, on reaching 100% , it said ''invalid update'' please, help me guys!
What should i do?


Phone: nokia 5330 DSTV mobile.