Dear
Please follow below:
1) Download the latest HUAWEI B593u-12 firmware upgrade> (.zip 26 Mb).
2) Save the file to your desktop and unzip the file when you are finished.
3) Open your browser and log in to your router via 192.168.1.1 (Username: admin; Password: admin - lower case).
4) Select System > Upgrade > select tar. (The file you just extracted from the .zip file) > press Upgrade, then wait for few minutes, the system will auto upgrade the firmware of the HUAWEI B593u-12.
These steps are also usable for HUAWEI B593s-22 and HUAWEI B593 other models. The firmware may vary varies.