I am trying to jailbreak my K4NT. Opened
https://wiki.mobileread.com/wiki/Kindle4NTHacking , downloaded/unpacked/copied "data.tar.gz & ENABLE_DIAGS files plus the diagnostic_logs folders to the Kindle's USB drive's root" and restarted the kindle Menu -> Settings -> Menu -> Restart. And it rebooted into the normal firmware, not a diag mode. The battery indicator reports full. What else to check?