RHEL 7.2 big endian BOOT ISO for powerpc not booting on Mac Mini G4

Dear all,
I downloaded RHEL 7.2 big endian ISO images for PowerPC and burned it into DVD-R drive.
Unfortunately, when I tried to boot from this disk on my old Mac Mini G4, it was impossible to boot from this - it was not recognized as booting disk.
Recently, I was able to install Debian without any problems, but I need RHEL.
Please, help.