Did litle(very litle) research and it seems Mt is limited/ by the chip they’ve used TF-470-BCL
http://www.cyberwin.com.cn/issuepic/200692132549t2i195.jpg
Haven’t found full spec of this chip but if it has hardware Web acceleration so this is why they prefer to use it, or maybe it’s not possible too implement other protocols with this chip 
hmm
seems there is tftp support
“MANAGEMENT
Setup and configuration through web browser
Firmware upgrade via TFTP or Web”