Why do you need to remove the logo? It should have no effect on updating the carrier file.
That's what I thought, too. But when I installed the new carrier logo I got an error until I uninstalled AT&T Carrier Logo. Reinstalled it afterward with no ill effects. Another example of Apple checking to make sure we've got a clean phone before upgrading us? *shrug*
Still no luck. Any other ideas what could be causing this? Or does the installation of the ATT Carrier change or alter anything else other than the png.s? Perhaps there is something else I need to change back...
According to Cydia, AT&T Carrier Logo changes the following files:
/System/Library/Carrier Bundles/ATT_US.bundle/Default_CARRIER_ATT.png
/System/Library/Carrier Bundles/ATT_US.bundle/Default_CARRIER_CINGULAR.png
/System/Library/Carrier Bundles/ATT_US.bundle/FSO_CARRIER_ATT.png
/System/Library/Carrier Bundles/ATT_US.bundle/FSO_CARRIER_CINGULAR.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/Default_CARRIER_M-cell.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/Default_CARRIER_ATT.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/Default_CARRIER_CINGULAR.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/FSO_CARRIER_M-Cell.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/FSO_CARRIER_ATT.png
/var/mobile/Library/Carrier Bundles/ATT_US.bundle/FSO_CARRIER_CINGULAR.png