I wouldn't recommend to buy this device. Let me ask you "if your device get bricked, how many ways would you get supported?". Suppose you had the situation and look for manual, forum, official web site.
I've used M90 for about a month now, but I've already had enough problems; the device get frozen three times, running out of battery on standby mode, etc.. There seems to be an active discussion forum in China, but little material is in English. The reset button is well hidden back side of the device, (btw, this hard reset button fixes all possible problems so far) and you should always bring a pin with the device.
To be fair, the device itself has a lot potential. Stylus pen works fine for navigating purpose. It can read large PDF and Djvu files fast, the display is clear and crisp. But with all this, I still don't recommend this. If you still think it is the only option you got, please think again and wait.
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