Hi guys, hope there is someone could help me with my kindle problem

Tried to solve it for a week still no luck
I got my paperwhite2 downgraded to 5.3.3 to jailbreak, everything was perfect until I tried to download my books, it shown pending to download.
And I have tried to logout my Amazon account, it said unable to connect. I think there is a connection problem. Still my paperwhite2 can search and connect to my WiFi.
Is there any method to solve it? Have searched through the forum still cannot find any solution.
Thank you all!!