Extract Huawei B612s-51d firmware 11.189.99.01.00 on your computer
Install the firmware update file for Huawei B612s-51d downloaded from Huaweiflashfiles.com
Follow the procedure for updating firmware that is given in Package.

Huawei Flash File | Size: 44.51 Mo
Version: 11.189.99.01.00
Operator: General
Operating systems: Windows 7/8/10/XP/Vista
Huawei B612s-51d Firmware Download