How to Mass update subject of task?

Hello Everyone,
We are using Zoho CRM from July this year. We are using the Task module as a service scheduler for our clients. but my users created the task with the wrong subject and now we have to change this.

But the number of wrong subjects task is huge i.e 2500+, I can't change this one by one.

So is there any way to update these wrong subject?

Kindly help.

Thanks & Regards
Shubham Agnihotri