May someone Help on HTC 816

May someone help me with this htc 816, my sister bought it from china to Africa but it wont get the network. when I type *#*#4636#*#* I wont see GSM 900 and 1800 0nly I see 850mhz and 1900mhz ,May someone give me the firmware that would work with 900-1800mhz 3G Gsm

Attached Images
File Type: jpg HTC 816.jpg (224.6 KB)
File Type: jpg htc pic2.jpg (206.6 KB)
File Type: jpg htc pic 3.jpg (158.8 KB)