I am providing here a simple guide on how to hack ur phone to install all unsigned games and applications, please follow these steps for all s60 v3 / OS 9 Phones.
01. You need to install X-plore (In Phone Memory)
02. Now install HelloCarbide.sisx (In Phone Memory)
03. Run X-plore
04. Go to C: Try to access c:sys, It should do nothing
05. DO NOT CLOSE X-plore
06. Run HelloCarbide press Options: Menu1: you will see 'Done...probably', Click Yes and then it will crash
07. Switch to X-plore
08. Try again to access c:sys, It should work now
09. Now copy appropriate installserver.exe to c:sys/bin/
10. You need to restart your phone
11. Now you can install any 'Unsigned' app without signing
Notes:
01. This tutorial is meant for advanced users only, if u do not know nething about it, please do no follow these steps, u may end up with a messed up phone.
02. Download Xplore Latest version from OS 9 Softwares Zone
03. Download Hello Carbide Here
04. Download Install Server For Ur Phone Accordingly:
» For OS 9.1 Nokia N77,E61i,E65,E93i,E91 8gb,E62,N93,N73,N80,N71,N92,E70,E60
» For OS 9.1 Nokia 3250,5500,E50,E61
» For OS 9.2 Nokia 6124,N82,N95,N95 8gb,E51,N81,N81 8gb,6121,6120,5700,6110,E90,N76,6290

To Install N-Gage New Edition Games, Follow These Simple Steps:
01. First of all hack ur phone using the above shown method
02. Install N-Gage 2.0 Application available in OS 9 N-Gage Games Zone On ur Card Memory (Password for zip file is ngage)
03. Install No Trial Patch On ur Card Memory, to make all games full version.
04. After Installing everything, u have to put .ngage file of the game in ngage folder(It must be there) in ur card memory, using Xplore.
05. Now Open N-Gage Application from menu, the game will automatically install