Downgrade Nokia E5-00 ?


I just bought a Nokia E5-00 (RM-632) with a software version 102.002.

As this version does not support AZERTY keyboard layout, I would like to downgrade it. I already have the required flash files (software version 71.003) ; therefore, my question is the following :

– How should I proceed?
– Which software should I install on my computer to do so?
How do I install the aforesaid computer software ?

To make it short, I need a tutorial on how to do this stuff (this is my first time 😀 ).

Thank you very much!