Can not acces to Open Firmware, need boot with USB, or any other dev/

Hello. Good nigth. Thank's for read my case. I'm trying to enable a MacBook 17" A1212. Al ports work fine, CDRW, USB, display, etc. But HDD ATA die months ago, so i take a newer and make it run. But now need urgently run any OS for take a job....

So i put a SSHD, to install debian or kali or gentoo, because that machine and his OSX, are not supported anymore. So i want to run Debian or Kali, but when try to boot with USB stick with (live linux version) cannot read the USB. So try to enter to Open Firmware with the known combination key, to tell the Lap Top boot from USB, but nothing yet.

Can someone help me?

How can i enter to the Open Firme using other way?