NOKIA 5800 Can`t install

**Cortezz** · 03-06-2010

I have Nokia 5800 mobile phone which is 1 year old. In the starting it don't have any problem. From the last week whenever I tried to install anything, it gives following error message:

Code:

unable to start operation. Installer already in use

I don't know why Nokia 5800 Can`t install anything. Please help me to fix this problem.

**Gonzo** · 03-06-2010

The NOKIA 5800 is a mobile "third generation", meaning it is equipped with Symbian S60V3 like most new Nokia, so applications are only accepted format sisx and I think that you are trying to install application in your mobile phone which has .sis extension. In this case you will only able to run only those application which has .sis extension.

**Pugsly** · 03-06-2010

Did you change the settings for deployment.
Go to: Settings = application = param.d 'install.
There for this to work you must have:
Software Installation = all
Verif online = off
Web address by default.

**Regina** · 03-06-2010

if you have an error of type certificate: "Certificate Expired or not yet valid", try changing the date of your phone by putting a few months back. Some applications that have a period of use may have expired over time. Here hoping you have a little light on the subject. I hope this will help you to solve this problem very easily.

**Simond** · 03-06-2010

I solved the problem fairly simple:

1) back up my data using PC suite
2) restoration of my system by typing the code: * # 7370 #
3) restoration of my data using PC suite

Total time: 10 minutes.
No particular problems to report (I just lost my contact bar ...)
And I can finally install the applications

**Juany** · 05-06-2010

I installed bright light touch that I lost during a reset and I am unable to install. I download it fine on my 5800, but when it is necessary to install, it starts up, and it said "unable to install". Is there a solution? Thank you in advance.