Are there any service releases installed ?
As long as you have 4.02a(sr2a) installed or higher,
you can download the device package (exe file) from CCO software downloads. The latest version is 4.0(45). This should give support for 7941/61s.
HTH
Sankar
PS: please remember to rate posts!
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus