Use Kindle app on Ipad 1 5.1.1

hey folks.

I have a jailbroken Ipad 1 version 5.1.1 and since there’s no available updates higher to be upgraded to, I wanted to make use of it and use it for kindle App, I tried downloading it but it says that it’s not compatible with my ipad. My question is, is there a way to remove the jailbreak and download kindle on my ipad ?

thank you folks.