hey please help? i have a android nexus one and don't know if it is rooted or if it has factory rom?

Kernel version: 2.6.29-01117-G4BC62C2 Android-build@apa26#1
Baseband version: 32.24.00.22U_4.03.00.21-2
please i need it to go back to factory rom so i can update to android 2.2 please let me know if i can do that and is it a rooted or factory rom i have currently please reply soon ,thank you
the Build Number is EPE76

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