download the img you need (CH or ENG)
rename it gmapsupp.img unlock with [Only registered and activated users can see links. ]
rename it HK.img and copy it in your sd in a folder named Map
In the rar file you'll find a China basemap
you can replace your basemap with the China one when using this map
read :[Only registered and activated users can see links. ]
backup your basemap on your pc and replace it (gmapbmap.img)