Error when downloading any signed apps : No valid ...

Question

I am using Nokia 2730 classic. Whenever I download any signed applications or browsers, after downloading it, it shows an error of 'no valid certificates' or 'certificates not on the phone'. In-built opera browser is also not responding as it shows a java null pointer error.
Another one problem is that, in music player when I turn it on, I only see a blank white screen however I can play music in it.
Please give me some solution, I also done software update but it doesn't work.
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Answer 1

I don't really know about the music player issue but I might have an answer for the certificates thing.
The 2730 classic is not exactly a recent phone. It was announced over 4 years ago. It could be that the software packages you're trying to install are also pretty old, meaning that the certificate with which they were signed may well have expired by now.
What you can do is try to set your phone's clock to a date in the past, say in 2010 some time, and then try and install those packages again. If that works then "old age" of the certificates is the answer.
Obviously, don't forget to put your phone's clock back to the correct date afterwards
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