I had the same problem with the Sony PRS T1, today I rooted it with minimal-root.zip downloaded from this forum
http://projects.mobileread.com/reade...lash_packages/
There is an Android app 'Cool Reader' which can display Chinese text:
https://dl.dropboxusercontent.com/u/...5/DSC_0065.JPG
The built in reader still cannot display Chinese. Maybe I can replace one of the built'in font with a Chinese one.
The full instructions for T1 is found at
https://wiki.mobileread.com/wiki/PRST...ing_and_Tweaks
maybe, there is one for T3 too.