Thank you for reaching out to the Samsung community! We do apologize to inform you that lock and mask app pin cannot be reset. You need to reset the device to reset the pin. Please do reset your device on factory mode after taking the data backup Via Smart switch.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
