Repair a Broken Phone Book⚓︎

Symptom⚓︎

No new entries can be added. When trying to add one, this error appears:

ERROR: phone book entry is faulty

Cause⚓︎

The file /var/flash/phonebook has become corrupted, regardless of how
or why it happened.

Solution⚓︎

As the path already suggests, a file in flash is broken and therefore
"only" needs to be replaced by a healthy one. Anyone with a Freetz backup
is in luck. Without a backup, the only option is to empty the phone book
completely:

    touch /tmp/leeredatei
    cat /tmp/leeredatei > /var/flash/phonebook
    rm /tmp/leeredatei

Afterwards, restart the box. The safest way is to briefly disconnect it
from power. During a normal reboot, it might otherwise save the corrupted
version from RAM back to flash before shutting down.

If you have a Freetz backup from a time when the phone book was still
valid, unpack the phone book from that archive, copy it to a USB stick or
to the box's RAM, and use it instead of the empty file to overwrite the
phone book in flash:

    # On the PC
    tar czf freetz-backup.tar.gz flash/phonebook
    scp flash/phonebook root@fritz.box:/tmp/newphonebook
    rm flash/phonebook
    rmdir flash
    # On the box
    cat /tmp/newphonebook > /var/flash/phonebook
    rm /tmp/newphonebook

Then disconnect the power again as described above.

Source: IPPF
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