What to do when Xiaomi MiPad suddenly displays unreadable texts?

I have recently purchased a Mi Pad on Aliexpress about 3 weeks back. I downloaded Cool Reader and Moon Reader to read both Chinese and English eBooks. Both were quite successful until now; when I turned on the software, the texts were unreadable (they displayed symbols like these ????? ????? ?????). I have re-set the Mi Pad but the result is just the same, so please educate me how to fix the problem.

Thanks

Sam Sze




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