Hi

I'm looking for HELP.

I have a N97, I have recently upgraded my phones software. Since then I cannot install any software.
It gives me 2 errors: Unable to install protected application from untrusted supplier.
It also gives me a certificate error.

Please if anyone knows a way around this please help.

i don't know for nokia n97
but for certificate error. there's a common solution for
all nokia models
change the date back to two years
and then start the application !