Huawei ME909u-521 Troubleshooting,  Either CPIN or +CPIN can be used to authenticate the PIN

HUAWEI ME909u-521 LTE LGA Module
Application Guide	SIM Operation Application Scenarios

OK
AT+CLCK="SC",2	Request the SIM card state.
+CLCK: 1	"+CLCK: 1" means that the SIM card is
	not blocked.
OK
AT+CPWD="SC","<oldpwd>","1234"	Change the PIN (1234 will be the new
	PIN).
OK
AT+CPWD="SC","1113","1233"	Enter an incorrect PIN (first attempt).
+CME ERROR: incorrect password
AT+CPWD="SC","3333","1233"	Enter an incorrect PIN (second attempt).
+CME ERROR: incorrect password
AT+CPWD="SC","4711","1233"	Enter an incorrect PIN (third attempt).
+CME ERROR: SIM PUK required
AT+CPIN?	Check whether the password is
	requested.
+CPIN: SIM PUK
OK
AT+CPIN="12345678","0000"	Enter the SIM PUK and specify the new
	SIM PIN (activate new "SC" lock).

OK

Notes:

After PIN authentication is enabled using +CLCK, the module must be restarted for the change to take effect.

Either ^CPIN or +CPIN can be used to authenticate the PIN.

7.1.2Troubleshooting

Scenario	Possible Error	Solution
	Information
		If PIN authentication has
Enable PIN authentication.	+CME ERROR:	been enabled, it cannot be
	operation not	enabled again. Check
AT+CLCK="SC",1,"<pwd>"
	allowed	whether PIN authentication
		has been enabled.

Issue 01 (2013-07-05)	Huawei Proprietary and Confidential	47
	Copyright © Huawei Technologies Co., Ltd.