Added unlock support:

Modems:
ZTE MF197
ZTE MF827
Vodafone K4201-Z
ZTE Megafon M100-3

Routers:
Huawei E5172
Huawei E5372

Embedded modules:
Sierra Wireless AirPrime EM7700

Phones:
ZTE AT&T Z222
ZTE AT&T Z431
Huawei Ascend Y215
Huawei U8687
Huawei Cronos

Tablets:
Huawei S7-10x
Huawei S7-20x Slim

Added unlock tutorials:
ZTE Z222 text
ZTE Z222 video
Huawei E5172 text
Huawei E5172 video
Huawei E5372t text
ZTE Z431 text
ZTE Z431 video
Huawei S7 text

https://www.dc-unlocker.com/tutorials

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