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As a good user I have saved my shsh certificate file (since 3.1.3) for my 3GS (new bootrom). With that I can downgrade the firmware in the usual way. But with upgrading the firmware, we usually also upgrade the baseband. With the upgrade from 3.1.3 to 4.0 the baseband upgraded from 05.12.01 to 05.13.04.
When downgrading the firmware, the baseband does not downgrade. This happens since baseband 05.13.x.
Can someone explain more details? Can you confirm that the baseband now has the same upgrade mechanism with certificates by Apple like the firmware? If yes, is there a way to backup those certificates? Or are they included in the shsh file? Why is no downgrade possible? Because of missing downgrade software or because of missing certificate or because baseband never allows update to a lower version if it's working or what?
Can some insider explain this?
When downgrading the firmware, the baseband does not downgrade. This happens since baseband 05.13.x.
Can someone explain more details? Can you confirm that the baseband now has the same upgrade mechanism with certificates by Apple like the firmware? If yes, is there a way to backup those certificates? Or are they included in the shsh file? Why is no downgrade possible? Because of missing downgrade software or because of missing certificate or because baseband never allows update to a lower version if it's working or what?
Can some insider explain this?