Airtel has recently launched the Huawei modem with the latest custom firmware 21.157.13.00.284, the Huawei E1731. Above the dongle, it is printed as E1731, but inside the modem, you will see Huawei E173cs-1. Huawei E173Cs-1 firmware is totally different from the previous firmware of Airtel E1731 (E173Bu-1). Before this, Airtel had launched a modem with custom firmware version 11.126.16.04.284, which is not unlocked in the market. The Hardware version of Airtel E173Cs-1 is CH2E303SM. Firmware version 21.157.13.00.910.B757 works perfectly with the E173Cs-1 data card and can be unlocked. When you flush, then it will ask you for a flash code. You can download Universal master code and just run this.
Put your modem IMEI Number in the appropriate box, and click on the Calculate button. Now you will get the Unlock code and Flash code. When you flash your modem, it will ask for a code, then provide a flash code.
Now put another SIM in your modem and connect with your laptop/PC. It will ask for the unlock code. You have already got an unlock code for your modem through the Universal master code. Please don’t use it, because it will not accept it. This software generates unlock codes for 35 series IMEI numbers, but if will see your modem inside you will get the 86 series IMEI number.
Download Firmware 21.156.00.00.910 or 21.157.13.00.910
