Kindle 4th gen (K4) Jailbreak

Registering your kindle # it looks like you need a registered kindle to apply the jailbreak, as of now (2026-08) it shouldn't be possible to register devices released prior to 2012, our Kindle 4 is in this list: https://www.amazon.com/gp/help/customer/display.html?nodeId=TRXsYxKJr4WTdsVs2P But it seems there is a workaround to register it, which worked on my Kindle 4: 1 - Reboot Kindle. 2 - Log in…