Unable to install a protected application from an untrusted supplier - If you experience this one then try to follow the instructions below:

First you need to go to ->
menu - settings - application mgr. - installation settings and change software installation to “all”, but beware some software might harm your phone.

Then download the Samsung i850 theme using either of link below and store it in your Pc.

Fp1 Version Samsung i850 here
Fp2 Version Samsung i850

The next step is to sign in on this link https://www.symbiansigned.com/app/page >> choose Open Signed Online.

Type *#06# in your Nokia 5800 XpressMusic

Whatever the numbers came out on the phone’s screen, type it on the IMEI number, then your email address and click browse and locate the Samsung i850 theme in your PC.

Click “Select all” >> Type the numbers and letters combination as what appeared on the image >> Accept legal agreement by checking the checkbox then click the “Send” button.

Note: Please follow the email instructions.

I hope this could help you guys, don’t hesitate to comments whatever feedback you’ve got.

Stumble it!