Back to Mavericks

[Alxd]

Please need some help here .

I downloaded 10.10 Developer Preview into my desktop then reboot with the Yosemite Installer , i cancel the installer at the boot so i didn´t install it yet but now i can´t back to Mavericks , when i boot Yosemite is trying to install it , seems like is mount on the Mavericks drive , how can i unmount and back to Mavericks?

Thanks
Alxd

 

[DeltaMac]

restart, going into Safe mode, by holding the shift key.
That should prevent the installer from automatically beginning the install.
If you did start the installer already, and it had the chance to install a few of the files (which it would normally do), then you may already need to use your backup. You DID have a good backup before your started a major upgrade of your system, right?

 

[Alxd]

I tried but i can´t start in safe mode , yes i have a copy but is really old, there is any way to unmount from single user mode?

I boot from other system and i can see the Hd with Mavericks intact

Thanks