Cannot Update Credentials of Zoho crm in Zoho books

Cannot Update Credentials of Zoho crm in Zoho books

Greetings, 

We've made an integration between zoho crm and zoho books.. 
By mistake.. I've generated a new ZSC Key in zoho crm 

The problem is I cannot update the credentials in zoho books.. I only have (Disable integration) option.. 

How can I update the credentials without losing any data?