gw1600 can't access it with default address

vs-gw1600v2-4g can't access it with default address

Hello.
I have bought Openvox gw1600 (vs-gw1600v2-4g) with 1 module(for 4 sim cards).
But after opening i can't access it with default address http://172.16.98.1/ and 255.255.0.0
I have tried to switch my pc to 172.16.99.1
I have tried to reset the device. Holding reset button for 6, 7 or more seconds doesn't work as well. Nothing helps.
Please help me.

I use this instruction.
www.openvox.cn/pub/documents/manuals/Vox...away_User_Manual.pdf

Address : Saroj Tower, Office No:- 15, First Floor, 59/1, above Bank of Baroda, Kalkaji Extension, New Delhi, Delhi 110019

Phone No: 9066677770

Hello sir

What can we do for you ?