A few days ago I played with my Rikomagic V5 TV Stick, I flashed a wrong RK3288 firmware and I bricked it.
Everytime I tried to flash back the stock image, after the short circuit of the NAND pins - in the Mask-Rom mode, I got always the same errors: 'Match device type failed, stop running!' and 'Wait for loader fail', with blue square on the first position in Rockchip Batch Tool. 'Switch' button didn't work neither.
Read more http://chinagadgetsreviews.blogspot.ro/2015/02/how-i-manage-to-unbrick-rikomagic-v5-tv.html.