if you can retrieve the image filename on flash ("dir") and try a search the internet on this filename with version removed
Cisco SGE2000P 24-port Gigabit Switch - PoE - Retirement Notification
The Cisco SGE2000P 24-port Gigabit Switch - PoE is now obsolete (past End-of-Life and End-of-Support status).
End-of-Sale Date: 2012-12-30
End-of-Support Date: 2017-12-31
- so Cisco will not provide the firmware anymore on it's website
- it is possible no newer firmware exists