Old ATV1 Update

Hi guys n gals, newbie here…

Iv recently inherited an old ATV1 thats running XBMC Eden. I am currently using the new version of Kodi on my usual HTPC so I am familiar with the environment.

I am wanting to upgrade the ATV to helix stable. It is currently running Crystalbuntu.

I have gone through many forums on here but cant find one set to exactly what I want, could someone please help me get this updated some way shape or form please? I am a Windows user but do have PuTTy downloaded, I can remove the HDD if needed from the ATV…

Thanks in advance