Extract Huawei E3351s-2 Firmware 21.146.31.00.159 on your computer
Install the Firmware update file for Huawei E3351s-2 downloaded from Huaweiflashfiles.com
Follow the procedure for updating Firmware that is given in Package.

Huawei Flash File | Size: 14.65 MB
Version: 21.146.31.00.159
Operator:Orange Poland
Operating systems: Windows 7/8/10/XP/Vista
Huawei E3351s-2 Firmware Download