in the link given above FOTA 1.60 <1.62 the update is only installable online.
In this post he gives a intallable link: h - p: //bbs.nubia.cn/thread-320216-1-1.html
Manual update 1.60 <1.62 Link:h--p://dl4.ztems.com/zxmdmp/download.do?doWhat=getUp&filename=firmwarepackages/NJ/ZTE/NX507J/24053/NX507J_160_162.up
If I understood about 1.60 and official recovery without root