How to factory reset a Gingerbread device?

I found an old phone of mine while cleaning, and would like to donate it. I've googled how to do a factory reset on a gingerbread device, and all of them say the same thing: go to Settings -> Privacy, and then click the Factory Data Reset button under Personal Data. The problem is, I don't have that option. My Privacy settings only have Lock Screen (display message text), and Backup and Restore (Back up my settings and Automatic Restore.) I don't have a Personal Data section. The phone does not have a SIM card installed, but does have a google account attached, plus a lot of apps with on-board data. I know I can disconnect the google account, but how can I wipe all the apps and reset the phone to "new"? It's a rooted HTC Sensation, if it matters, and I think is running CyanogenMod. (Like I said, it's an old phone...)