Enter pin2 +cpin2, Security commands, 2 enter pin2 +cpin2 – Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) User Manual
Page 174: At+cpin2=[,] ok, At+cpin2? +cpin2:

Security Commands
Enter PIN2 +CPIN2
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WM_DEV_OAT_UGD_049 - 001
VOLUME 1
August 23, 2007
9.2
Enter PIN2 +CPIN2
9.2.1
Description
This Wavecom proprietary command is used to validate the PIN 2/CHV 2 code or to
validate the PUK2 code (UNBLOCK CHV2) and to define a new PIN 2/CHV 2 code.
This command is only used when the last command executed resulted in
PIN 2/CHV 2 authentication failure.
PIN 2/CHV 2 length is between 4 and 8 digits, PUK2 length is 8 digits only.
After three unsuccessful attempts, PUK2 will be required. PUK2 validation forces the
user to enter a new PIN 2/CHV 2 code as a second parameter and this will be the new
PIN 2/CHV 2 code if PUK1 validation succeeds.
9.2.2
Syntax
Action command
AT+CPIN2=
OK
Read command
AT+CPIN2?
+CPIN2:
Note: No OK
Test command
None