So, I tried following this guide to jailbreak my kindle4NT:
http://yifan.lu/p/kindle-touch-jailbreak/
After step 1 and 2 had no effect, I used the "cp" command in the mac os terminal to copy data.tar.gz and then "touch ENABLE_DIAGS". After that I have been stuck in recovery mode and can not boot to normal kindle mode. I have tried using MfgTool from windows but i cant seem to set my kindle in usb download mode, it just reboots when i hold the power button + home. So MfgTool does not find my kindle.
I have also tried to remove the ENABLE_DIAGS file from terminal but the kindle still reboots into recovery mode.
My 3:rd try was to use the Kubrick image, but it is stuck at Waiting for device...
When trying to reboot/disable diags from the kindle interface, nothing happens..
Any ideas on what to try next?