I have bought Zenithink ZT-280 C91 from ebay. Hardly used it for 1 month. Initially itself it had some boot problem once the power is drained. One day it was not booting and was showing ZT Pad boot logo and was not booting. Instead was showing Kernel error. I tried updating the firmware from zenithink website but it didnt work. No support in India.
Lesson learnt : Never buy cheap Chinese tablet.