For security reason all banks are planning to upgrade their ATM card to chip Level, so bank will automatically send new ATM to registered address and the 6 digit OTP they will send as SMS to your mobile number,the validity for that ATM is 30 days,so if you not used within that days it will expire. so the question is How to regenerate HDFC bank new ATM OTP, here are going to explain you how to regenerate HDFC bank new ATM OTP.
Send below sms to 5676712 REPIN [LAST FOUR DIGIT OF YOUR ATM CARD NUMBER]
if you send this sms ,within second you will get a 6 digit otp,we can use this otp to set new atm pin from any of the hdfc bank atm,you should type the new opt followed by your registered mobile number
if your not registered with phone banking,you have to register to phone banking first,below is the structure to register for phone banking
Send SMS to Register Phone banking
Send an SMS to 5676712 REGISTER [YOUR CUSTOMERID][LAST FOUR DIGIT OF YOUR ACCOUNT NUMBER]