In this post, you will get all available firmware and WebUI download link absolutely free. You can refer to the unlocking of the Tata Photon Max 3G WiFi Data Card (Huawei E8231s-1). I had also unlocked Huawei E8231 Life (Belarus).
Note: Firmware may ask you for code; leave a comment below with model and IMEI to get it free. However, unlock code is chargeable.

Download Firmware Update Huawei E8231s-2 22.618.01.01.778 (Russia Open Market)
Download Firmware Update Huawei E8231s-6 22.621.07.00.1074 (Colombia SKYWAV)
Download Firmware Update Huawei E8231s-6 22.621.07.00.00 (Ecuador)
Download Firmware Update Huawei E8231s-2 22.621.13.01.1217 (West Europe)
Download Firmware Update Huawei E8231s-2 22.621.13.00.91 (Malaysia)
Download Firmware Update Huawei E8231s-2 22.621.13.00.839 (Tunisia)
Download Firmware Update Huawei E8231s-2 22.621.13.00.784 (Greece Wind)
Download Firmware Update Huawei E8231s-2 22.621.13.00.1244 (Algeria)
Download Firmware Update Huawei E8231s-2 22.621.13.00.120 (Angola)
Download Firmware Update Huawei E8231s-2 22.621.13.00.00 (Universal)
Download Firmware Update Huawei E8231s-2 22.618.01.00.778 (Russia Open Market)
Download Firmware Update Huawei E8231s-1 22.618.01.03.408 (Airtel or Zain Nigeria)
Download Huawei E8231s-81 Update WEBUI 17.100.11.00.03 (Universal)
Download Firmware Huawei E8231s-81 Update 22.621.05.00.00 (Universal)
Download Firmware Huawei E8231s-81 Update 22.618.99.01.00 (Universal)
Download Firmware Huawei E8231s-6 Update 22.618.99.56.00 (Universal)
Download Firmware Huawei E8231s-6 Update 22.621.31.00.00 (Universal)
Download Firmware Huawei E8231s-6 Update 22.618.99.57.00 (Universal)
Download Firmware Huawei E8231s-1 Update 21.518.99.08.00 (Universal)
Download Huawei E8231s Update WEBUI 17.100.08.00.03 Universal
Download Huawei E8231s Update WEBUI 17.100.05.03.778 (Russia OM)
Download Huawei E8231s Update WEBUI 15.100.10.00.625 (Dominican Republic)
Download Huawei E8231s Update WEBUI 15.100.09.01.113 (India Tata Photon)
Download Huawei E8231s Update WEBUI 15.100.09.01.284 (Airtel India)
Download Huawei E8231s Update WEBUI 15.100.09.00.03 (Universal)
Download Huawei E8231s Update WEBUI 15.100.10.00.784 (Greece Wind)
Download Huawei E8231s Update WEBUI 15.100.10.01.120 (Angola)
Download Huawei E8231s Update WEBUI 15.100.10.00.839 (Tunisia)
Download Huawei E8231s Update WEBUI 15.100.10.01.91 (Malaysia)
Download Huawei E8231s Update WEBUI 15.100.10.00.93 (Mauritius)
Download Huawei E8231s-2 WebUi Update 17.100.05.00.03 (Universal)
Download Huawei E8231s-1 Firmware 22.618.01.02.910 (Universal India)
Download Huawei E8231s-1 WEBUI Update with Profile Creating (India Open Market)
Download Firmware Huawei E8231s-1 Update 22.618.09.00.00 (Universal)
Download Firmware Huawei E8231s-1 Update 22.618.09.01.162 (Morocco)
Download Firmware Huawei E8231s-1Update 22.618.79.03.284 (Airtel India)
Download Huawei E8231s-2 Firmware 22.621.17.00.778 (Russia OpenMarket)
Download Huawei E8231s-2 Firmware 22.621.23.00.00 (General)
Download Huawei E8231s-1 Firmware 22.618.01.02.910 with profile
why is it when opening the files with winrar it gives an error. please help
Which firmware?
e8231s-2
imei 862870024708623
862870024708623 Firmware Code = 37227325
IMEI 862869021018325
Update wizard password
862869021018325 Firmware Code = 44245408
E8231s
862869028310238
862869028310238 Firmware Code = 48127775
867638020687470
867638020687470 Firmware Code = 55163284
867638020687470 Firmware Code
867638020687470 Firmware Code = 55163284
imei 862869023492312, plz give password
862869023492312 Firmware Code = 59664234
IMEI 862869026406020
Update wizard password
862869026406020 Firmware Code = 63258088
imei 867638020650361, plz give password
867638020650361 Firmware Code = 40173050
IMEI 86763802065361 Update wizard password
Wrong imei.
IMEI 862869021397505, help with password please
862869021397505 Firmware Code = 66176520
Is there any firmware update so that we can use E8231-S1 as a WiFi extender for India?
No
E8231s-1
IMEI 867638021888556
update password
867638021888556 Firmware Code = 55943415
Please assist with password imei 867638020613443
867638020613443 Firmware Code = 50762932
Please assist with password. IMEI – 862869020347535
862869020347535 firmware code = 64579448