yes.... the admin password is under IP Devices > IP Phone Configuration > Security Settings. I don't think there's a way to change multiple devices with a simple edit in Table view. You'd need to make a Template with the new Admin Password and apply it to all of the devices you want to change.
LoPath
Maintain HiPath 4000 V5 & V6, OpenScape Xpert V4 & V6, OpenScape Xpressions V7, OpenScape Contact Center V8, OpenScape Voice V9