Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 173)

Security Commands
Enter PIN +CPIN
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WM_DEV_OAT_UGD_049 - 001 VOLUME 1 August 23, 2007
9.1.6 Notes:
+CME ERROR: 553 is returned when the PIN 1/CHV 1 code is tried to be changed
using burned PUK 1 code.
+CME ERROR: 554 is returned when the PIN 1/CHV 1 and PUK1 codes try to be
entered when theses codes are burned.
.