Here is the result :

root@mythtv:~# irsend --device=/dev/lircd1 SEND_ONCE SA2000 10
irsend: command failed: SEND_ONCE SA2000 10
irsend: unknown command: "10"

root@mythtv:~# irsend --device=/dev/lircd1 SEND_ONCE SA2000 1

no problem with 1 number


Do I have to reinstall something ?

tryThere is probably no "10" button.

with : irsend --device=/dev/lircd1 SEND_ONCE SA2000 1 0

Sometimes, that send a 1 or a 0 or 10 or nothing.

Some people have written scripts that pause between sending each button. It may be that sending the two too close together means that your device is not receiving it reliably.

Try creating a script something like
and testing if it selects 10 reliably.