J'ai finalement trouvé la réponse du pourquoi je n'arrive pas à changer les version IPL & SPL, il faut en fait suivre à la lettre la procédure de Molski suivante:
Use this method when having problems with upgrading:
1. Downgrade to the 1.05 Rom ( ftp://xdada@ftp.xda-developers.com..._11210_.exe )
2. Download Lokiwiz 0.2b and extract it to the root of one of your drives, I'm using E: today on my Thinkpad.
3. Copy enablerapi.dll to your device with ActiveSync (don't create a partnership yet, explore as Guest), I just copy to it's root.
4. Execute enablerapi.dll from your device.
5. Open a Command prompt (<Start> <Run> type "cmd" without the quotes and hit <Enter>
6. Go to the root of whatever drive you extracted Lokiwiz to, my case I type "E:" <Enter>
7. Type "U" <Enter> .. wait and you device WILL soft reset. If it doesn't then you're not following instructions!
8. Stay at the Command Prompt!
9. Run Lokiwiz a second time and type "C" <Enter. Your device will reset a second time... if it doesn't you didn't follow instructions.
10. Exit the Command prompt
11. Downgrade to the 1.05 a SECOND time. Upon reboot, if you followed procedure, you will have a IPL and SPL of 1.x
Une fois que les versions IPL & SPL ont changé à la même valeur, il faut juste upgrader à la ROM FR 2.17...
A bientôt pour d'autres aventures