Kopano MySQL startup failure

I’m not sure if I do the right steps, when I add

[mysql]
port = 3306
innodb_force_recovery=3
innodb_purge_threads=0

in /etc/mysql/my.cnf,

But when I start the mysql service, I receive exact the same error as when I start them normally.
So my question is, did I apply the right settings to start mysql in the debugging mode?

[quote=]
Use specialized tools for backup if available.
[/quote]

This is the first task as soon everything is back available!