PW Kindle Paperwhite 1st Gen Registration Problem and Jailbreak

Hello all,

I have a Kindle Paperwhite 1st Gen 2012 model, 5.6.1.1 fw version. Then accidently I reset my kindle and I couldn't register now again. I have a two question.

1. How can I re-register again?

2. How can I install KoReader on my device? I couldn't download files from forum.