iPhone Preserve BB while updating to beta firmware?

[ceckin]

Hi guys, i'm trying to get iOS7 on my iPhone 4 and all went smooth (removed the BB from the ipsw, used PwnedDFU), but right before finished i got (-1) error and it turns out iTunes want to update the BB. Is there a way to update without having to change the BB (redsn0w was not updated in a while and its totally useless in this situation).

 

[dhlizard]

Use Sn0wbreeze (PC only)