For Grade 2 systems: After 10 unsuccessful attempts with the incorrect PIN, the keypad or browser will be disabled for 90 s; after a further 10 attempts with the incorrect PIN, the keypad or browser will be disabled for a further 90 s. Once a correct PIN has been entered, it will reset the counter back to zero allowing for a further 10 attempts before disablement.
For Grade 3 systems: After 10 unsuccessful attempts with the incorrect PIN, the keypad or browser will be disabled for 90 s; after each further attempt with an incorrect PIN the keypad or browser will be disabled for a further 90 s. Once a correct PIN has been entered it will reset the counter back to zero allowing for a further 10 attempts before disablement.