If you have not enabled net banking services to your account or you are facing any difficulty in the ASBA process, you can apply IPO using UPI (without ASBA).
If you have a demat and trading account with any broker, you can subscribe to an IPO using the UPI ID. All you need to do is provide your UPI virtual payment address and accept the payment mandate request sent to your UPI app. Once accepted, funds will be blocked till allotment.