There are three firmware that you could try for yourself. The links are translated by Google.
1.
tiGOr BOOK 2010 - MOD-2 firmware for lbook V3
2.
TIRWAL supports DRM MOBI&ADE
3. NEW SDK for HANLIN V3,V3+ from Russian forum
4. NEW SDK for HANLIN V5 from Russian forum
I will update them when they are changed. Someone should notify me it i miss.