No need to uninstall anything, just add the maemo.org community-testing repository, disable the old one and refresh.
deb http://repository.maemo.org/community/ diablo free non-free deb http://repository.maemo.org/community-testing/ diablo free non-free
Catalogue Name: Community SSU Web Address: http://repository.maemo.org/community/ Distribution: diablo Components: free non-free
Catalogue Name: Community SSU Testing Web Address: http://repository.maemo.org/community-testing/ Distribution: diablo Components: free non-free
http://repository.maemo.org/communit...el/Packages.gz 404 Not Found[IP:159.134.196.137 80] http://repository.maemo.org/communit...el/Packages.gz 404 Not Found[IP:159.134.196.137 80]