Huawei E173Cs-1 Airtel India, E173z-1 MTN Sudan detect and unlock guide

Unlock procedure will work on E173Cs-1 Airtel India and E173z-1 MTN Sudan modems with these firmware versions:
21.157.31.00.1043 (Build: Apr 23 2012 12:02:27)
21.157.31.00.284 (Build: Mar 17 2012 12:15:53)
21.157.13.00.284 (Build: Feb 16 2012 11:05:38)

Download firmware update

Extract archive and launch “DriverSetup.exe“.

Click "Start".

Wizard will detect modem and ask for firmware code.

Launch DC-Unlocker client software.

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Open Server tab, enter your username and password that you received after credits purchase. Click "Check login". (you can buy credits here www.dc-unlocker.com/buy)
If DC-Unlocker/Vygis/Rocker/Infinity dongle is connected, do not enter username and password, only click "Check login".

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Select manufacturer: Huawei modems, model: Huawei E303, proceed to "Unlocking" tab.

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Select "Generate Firmware code by IMEI".
Enter IMEI number.

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Click "Do job" button.
Software will generate firmware code.

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Enter generated firmware code to firmware update wizard and click "OK" button.

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Wizard will start to update modem firmware. Do not disconnect modem or turn off computer – you can damage modem.

Remove SIM card from modem.

Launch DC-Unlocker client software.

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Open Server tab, enter your username and password that you received after credits purchase. Click "Check login". (you can buy credits here www.dc-unlocker.com/buy)
If DC-Unlocker/Vygis/Rocker/Infinity dongle is connected, do not enter username and password, only click "Check login".

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Select manufacturer: Huawei modems, model leave Auto detect (recommended).Press "Detect" button (Big magnifying glass).

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Wait till DC-Unlocker fully detects modem.

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Open Unlock tab, select “Read unlock code and auto enter to modem”.
Click “Do job”.

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Wait till you see a message that modem is unlocked.

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After you see that unlock is successful, restart modem.