We need to know what Tablets you have before we can try & help. If i phoned a garage and said have you got an engine. I need one. You would be asked what car you had. Its the same thing really. Without some knowledge of what it is. & what the problems are, were unable to assist you.
Its difficult to know what it is without a model no or type. Where did you buy it from? Was it advertised as wm8650? If so there may be help but if not I can't say for sure. On this forum there are plenty of posts about firmware(your Tablets software types). They vary greatly between whichever cpu is used eg wm8650, rockchip, allwinner etc etc etc. Most wm8650 can be sorted out using a custom built firmware called uberoid. This works with some other Tablets cpu's but is mainly for 8650 based devices of which there are many. If you can. Find details of what you bought ( say you got it from ebay or amazon, you will have records of your transaction & these should cover name of item/ specs etc) it would be useful.