An update of my case. After struggling 2 days with NAND write fail and trying lots of firmwares... I succeeded to install CMW recovery tool. From that, I installed Cyanogenmod 10.0.2. I struggled to make it boot too as it looped on cyanogen logo many times.
Now I must confess that I am afraid of rebooting the phone as I thought it was dead
Hope it helps someone else