Zte Modem Unlock Tool <QUICK — 2025>

For many older ZTE modems (MF112, MF180, MF627), NCK =
f(IMEI, seed) where seed is found in firmware at offset 0x1FBC0.

A Python pseudocode:

def generate_nck(imei):
    # stripped-down ZTE algorithm
    imei_digits = [int(x) for x in imei if x.isdigit()]
    s = sum(imei_digits[-8:]) * 13 + 0x5F
    nck = str(s % 100000000)
    return nck.zfill(8)

Note: Modern ZTE devices use stronger crypto. zte modem unlock tool

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Unlocking usually involves changing specific NV (Non-Volatile) items (e.g., item 833, 946, 4382 on ZTE). For many older ZTE modems (MF112, MF180, MF627),

AT+ZSNT          → Get lock status
AT+ZOPRT=?       → Check operator lock
AT+ZCLCK="NCK",<code>   → Enter unlock code
AT+CRSM          → Access SIM/EFS

Example response for a locked modem:

AT+ZSNT
+ZSNT: 1,234,01   (1=locked, 234=UK, 01=Vodafone)