Setting IMEI on my Galaxy S

Hi all,

I'm having a galaxy S GT-i9000 on which SIM card was not recognized anymore a few weeks ago, with no evident reason. It was like if nv_data.bin was corrupted.
I have tried with another SIM card but with no success.
I have tried to reinstall original ROM SFR Vodafone BUJVI but problem was the same.
I have installed Generic ROM I9000XXJVS_CL565837_REV03; Again same problem.
Today the situation is :
*#06# gives no IMEI at all
*#1234# says :
PDA : I9000XXJCVS
PHONE : unknown
CSC : I9000OXAJCVS

There is no nv-data.bin and no nv_data.md5 under /efs (I have no backup, I may have lost my backup during a re-partition).

The are so many threads on xda forum and so many cases that it's quite difficult for me to select the good ones in a way to repair my phone.

Can you give me advice ?
I still have the box of the phone where IMEI is written. Is it possible to download a "generic" nv_data.bin and write IMEI inside with HEXA editor or something like this ?
Do have I to download another ROM ?

Thank you very much
Thierry

Download from this link