@RInform Since nobody has answered, i will try to answer this, with my limited knowledge of UPI application process. I do not use UPI, always ASBA.
.According to my knowledge, if it is an retail application then it can be cancelled upto 5 P.M., last day, but some brokers might have earlier timing, check with your broker first, to be very sure..
Unblocking will happen after allotment is out, same or next day..
Others please correct me if i am wrong..🙏🙏