I have first tried to patch fw 2.40: if I don't check "adjust firmware version", no upgrade. If I put "1", it's good: "patched firmware" appears in the gps, and I can load jnx files in the birdseye folder, they appear activated in "digital globe" with demo.jnx. It's marvellous for me. I also tried to downgrade to original gupdate 2.40. It works, but the data is lost. No matter. Now, I'll try with fw 2.60, but I am not yet sure that firmwarepatcher v2.90 works with it, in order to see jnx files.
Great thanks