It would be interesting to see how current KOReader Android releases work on this device. Today's .apk
http://build.koreader.rocks/download...9-gb4bb322.apk
I usually use "Save as" and trim the file name down, like this: koreader-android-v2015.11-1339.apk
The cases use a magnet to activate a switch in the device, if you can put a piece of aluminum (ok correction, steel, something magnetic) behind your device, in the case, it will probably keep the magnet from affecting the device, while it is folded back.
Luck;
Ken