certificate expired - Nokia

I came with a new problem in my Nokia Phone when trying to install themes downloaded from the web, “certificate expired” to over come this problem, you should follow some simple steps below

To accept all applications and solve this issue:

Go to Tools > App. mgr > Options > Configuration

Change “software installation” from “Signed Only” to “All”
and
“Online certificate check” to “off”.

Now, install the files

if it doesn’t help, that means you're either using the wrong themes for the phone, or the person who created them didn’t sign them for a long time.

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