Hi Michel,

The master password is stored in your Odoo configuration file. You can find it in the file behind the variable 'admin_passwd'. The file is usually under /etc/. You can open it like this:

sudo nano /etc/odoo-server.conf

If you see a very long password in there it means that it has been hashed (Odoo does this automatically when set from the Odoo website). If this is the case there is no easy way to uncover the password. In that case just change the file and set your new master password in there. For example:

master_passwd = someverylongpassword12345#pae9e0

Afterwards you just have to restart the Odoo service to load the new master password. If your Odoo is restarted you can use the just created master password. You can restart your Odoo like this:

sudo service odoo-server restart

Regards,
Yenthe