F12 upgrade froze and does not recognize F11 anymore

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http://forums.fedoraforum.org – During the upgrade I switched into 1st text console and ran top, after a while I tried to return into anaconda, but instead computer froze and I had only an option to reboot with a reset button. When F12 booted from DVD again, it did not recognize F11 and I started install w/o formatting hoping it will simply overwrite F11, but instead anaconda threw an error message "Error running transaction, old package found". That will teach me not to install anything until a few months later. (HowTos)