If a backup tape fails to boot, you can still install by using a mksysb image stored on the tape.
Boot the machine from the product media (Volume 1 if there is more than one volume), then install the backup from Maintenance mode. For instructions on booting, refer to Installing the Base Operating System. Follow the instructions to the point when the Welcome to the Base Operating System Installation and Maintenance screen displays.
If your system fails to boot from a mksysb tape, you may have encountered a problem which can be identified and resolved with these instructions. Affected systems include all CHRP architecture systems, which started with the model F50. Access the firmware command line prompt, which usually appears as an option in the SMS menus. At the firmware command line prompt, type following two commands:
setenv real-base 1000000
reset-all
The system will then reboot, and you will be able to boot from tape, assuming that you have an otherwise valid boot image on your tape media.
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