pfSense

From the webGUI I did Reset to Factory Defaults. It seems to try to deleted various folders in /conf (among other things) but does not have success at that. The system does shutdown and reboot back to Factory Defaults OK. I guess it just does not quite clean up everything that it wanted to.
Running on APU nanoBSD.

Output is:

Warning: unlink(/conf/sshd): Operation not permitted in /etc/inc/util.inc on line 1503

Call Stack:
0.0002 232232 1. {main}() /usr/local/www/diag_defaults.php:0
0.1311 1470856 2. reset_factory_defaults() /usr/local/www/diag_defaults.php:85
0.1587 1472408 3. unlink_if_exists() /etc/inc/config.lib.inc:620
0.1589 1472888 4. array_map() /etc/inc/util.inc:1503
0.1589 1473504 5. unlink() /etc/inc/util.inc:1503

Warning: unlink(/conf/backup): Operation not permitted in /etc/inc/util.inc on line 1503

Call Stack:
0.0002 232232 1. {main}() /usr/local/www/diag_defaults.php:0
0.1311 1470856 2. reset_factory_defaults() /usr/local/www/diag_defaults.php:85
0.1604 1472408 3. unlink_if_exists() /etc/inc/config.lib.inc:620
0.1605 1472888 4. array_map() /etc/inc/util.inc:1503
0.1605 1473504 5. unlink() /etc/inc/util.inc:1503

Stopping package arping...done.
 Stopping package System Patches...done.
 Stopping package Service Watchdog...done.
 Stopping package Cron...done.