roll back from version 3.5.41 to version 3.5.40.1

roll back from version 3.5.41 to version 3.5.40.1

I updated my mobile app and now the phone that i updated it on doesnt work, the zoho app I mean. I had code written that managed my calls and scheduled calls forward for me, its an integral part of my business.

I have version 3.5.40.1 installed on a different phone and it works perfectly there.
on version 3.5.41 it doesnt work at all

PLease advise, this is urgent!