Guys, i've solved the problem; follow these steps:
. After the installation of the cfw to rogero, download YAB to allow the PS3 access to SEN.
. Open Multiman.
. Select a game, from settings choose 'update' and then download the update of the game!.
. To run backup, be sure to enable the settings 'external' + 'bdmirror' if your game are on external HDD, but if they are on internal HDD selected 'internal' + 'bdmirror'.
PS: about doa5 error, make sure u have downloaded the DUPLEX "repack" version!