IMPORTANT Notice:
    In order to modify the API's default password,You must reset the device to factory default settings to take effect!

    To enhance the stability of filesystem on VoxStack GSM gateway, we decide to change the FileSytem Format!
    So we need to update firmware to middle version 2.2.2 first if the current version on your devices is older than 2.2.2, then update to latest version. 
    PS: All versions must be updated to 2.2.2 first, pls do not try to skip 2.2.2 and  update to latest version directly, it will fail! 

    Middle version: https://www.openvoxtech.com/pub/firmwares/EOL/GSM%20Gateway/wg400-current.img (2.2.2)
    Final version:  https://www.openvoxtech.com/pub/firmwares/EOL/GSM%20Gateway/wg400-current.bin (2.5.8)