Make ZTE MF831 works with TP-Link TL-MR3020

Since November last year, after 2degrees upgraded their network and was starting to abandon 2G cross the region, the 3G connection disconnected every 15 minutes. I know it because we have over 50 movie kiosks which originally were using 2degrees 3G network to sync the data. We had to move on. Lucky, Spark gave us a …