Hello.
1) I upgraded to 5.5.0 via web
2) I then (for some reasons) tried to downgrade to 5.4.0-5.4.5 via tftp (several times, unsuccessfully)
3) I then flashed 5.5.0 again via tftp
Now the problem is: device activates via SADP successfully, new passwords set OK, i can modify IP etc.
But web...