Extract Huawei E303Fs-3 firmware 21.158.13.01.900 on your computer
Install the firmware update file for Huawei E303Fs-3 downloaded from Huaweiflashfiles.com
Follow the procedure for updating firmware that is given in Package.

Huawei Flash File | Size: 9.78 Mo
Version: 21.158.13.01.900
Operator: TRUE (H) Thailand
Operating systems: Windows 7/8/10/XP/Vista
Huawei E303Fs-3 Firmware Download