You should use just the menu button (not SET) to open the main camera menu, and then go to the very bottom of the menu.
I realize I had forgotten to set the card in LOCK position!
This time I have access to the Firm Update menu.
When I press OK for changing from version 1.0.0.0. to 1.1.0.0. the CHDK screen appears for 1 second and disappears. And when I check for the version, it is back to 1.0.0.0.
After several trials a message in german appeared ERROR : modules not available
I think I must start all over again as you suggested. Thank you very much for your help
When trying to format the card with the terminal using safe mode to avoid the busy device message, I obtain this :
Mac-Pro-de-ADMINISTRATEUR-905:~ administrateur$
Mac-Pro-de-ADMINISTRATEUR-905:~ administrateur$ sudo newfs_msdos -F 16 -v Canon_DC -b 4096 -c 128 /dev/disk5
Password:
newfs_msdos: warning: /dev/disk5 is not a character device
512 bytes per physical sector
/dev/disk5: 7744000 sectors in 60500 FAT16 clusters (65536 bytes/cluster)
bps=512 spc=128 res=1 nft=2 rde=512 mid=0xf0 spf=237 spt=32 hds=255 hid=0 drv=0x00 bsec=7744512
Mac-Pro-de-ADMINISTRATEUR-905:~ administrateur$
I obrain the same message using /dev/disk5s1
What did I do wrong ?