Official Download Link: Firmware 2.5

[ZunePet]

Zune 30: http://resources.zune.net/firmware/v...el02051614.cab
Zune 80: http://resources.zune.net/firmware/v...co02051614.cab
Zune 4/8: http://resources.zune.net/firmware/v...us02051614.cab

Note: These links serve no purpose other than reference and hacking. These are available so that people who are going to attempt to downgrade, decompile, or in some other way hack the firmware can get access to them. If you wish to install the newest firmware, please do so by telling your Zune Software to "Check for Device Updates" (right click your Zune in the panel). If you do not wish to try to hack the firmware, or you do not know how to decompile binary files, please do not download this file.