Yes, bank account details can be updated before completing a new loan application/e-sign process, when the update option is available in your Loan Offer.
To update them, open the Loan Offer page, select Edit next to the Disbursement Account, enter the correct account number and IFSC, and confirm that the account belongs to you.
Once a loan has been disbursed, the bank account linked to that loan cannot be changed.
If your loan has not been disbursed and you cannot find the update option, contact Support for assistance.