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From where you get (ssl1.nfi) and this is for which sim and what version is it?
For your Dreambox DM800se Ferrari sim last bootloader is SSl87F Here
So First use Optiflasher and flash SSl87F then unplug box after that flash any image with same SSl87F Then unplug and plug your box..If your box work well NEXT TIME IF YOU WANT FLASH NEW IMAGE NO NEED TO FLASH SSL87F BECAUSE ALREADY YOUR BOOTLOADER WAS UPGRADED.
For your Dreambox DM800se Ferrari sim last bootloader is SSl87F Here
So First use Optiflasher and flash SSl87F then unplug box after that flash any image with same SSl87F Then unplug and plug your box..If your box work well NEXT TIME IF YOU WANT FLASH NEW IMAGE NO NEED TO FLASH SSL87F BECAUSE ALREADY YOUR BOOTLOADER WAS UPGRADED.