how to revert to titan v24 ? on v25 and not working . v24 worked fine , cant figure how to do now on v25 cant set anything previously on v24 everything worked now error that power-settings file exists when i know it does not checking with opem ssh on pc . can anyone help ? had all commands copied that worked before

rm -f /etc/default/kernel-power
ln -s /usr/share/kernel-power-settings/my-default/etc/ideal/kernel-power

and
/usr/sbin/kernel-load

but now error

ln: kernal-power: file exists