Root [Sprint] question about CM Nightlies..

[JimKnuckles]

Hello

I just flashed the 12/16 CM Nightly, and the camera isnt working. I still have the 12/14 (last nightly) on my SD.

Can I reboot into recovery and flash that 12/14 nightly without wiping? Can you go backwards without wiping the device? Could I reinstall a previous nightly OTA, by using the cm updater screen?

I'm just not sure if I can reinstall a previous nightly over the latest one without having to wipe