These two applications need to be signed and the developer has not done because of some restrictions. you will have to sign it yourself try your luck at https://www.symbiansigned.com/app/page

i have all my unsigned applications got it signed through this site only

I must mention that this problem ONLY occurs when I’m trying to install these two applications, by any other app there’s no problem at all…

Do you think I must reinstall my new firmware? Hopefully there’s another solution.

Go to “Applications” > “Application Manager” (App. Mgr.)

select “Options” > “Settings”. Change “Software installation” from “Signed only” to “All”

After this you should be able to install your software.

If it doesn’t help, you know where to find us!

I have a problem for a while now and I still haven’t found a solution for it, so I’ll just try my luck here.
Whenever I try to install a cool app like this (Flip Silent) or RotateMe by Samir I get a note just before it even starts installing it. Here’s the message: “Certificate error. Contact the application supplier”.

Now, I know that this may be an easy problem to solve, but as it seems, not for me.

I know there are some really nice guys that will give me a hand here, so please, be so kind and give me the answer for my problems.