Downgrad Kodi

Hi ! I’am French and I have just install Kodi with my Atv Flash Black 2.5 and uninstall Gotham with ssh terminal mac os x yosemite !!!
But I see the last stable version of xbmc are Frodo 12.3 because have enough Ram
I want to downgrad Kodi to Frodo ?
Do you help me please ?
thank you