Step1: Please check your PCB mark (Update / new firmware)

Step2: Download applicable firmware according to flowchart as follows.
Step3: After download applicable firmware in local PC,please update as follows
　　　Update -> New Firmware
　　　Mothod : http
　　　Code Type : Risc
　　　Select voip.gz (no need to unzip)
　　　Click [update].
Important !!!
Please note: Don't press any key or turn off power or break internet till you see homepage of MV-37X.
It is about 2-3 minutes after press [update].
Otherwise,it will cause serious problem