K4NT no SSH access

[sadK4NTowner]

Hello,
Recently I faced a problem with KUAL not able to run due to expired developer cert.
I noticed that there is a solution already to this problem, so I tried to apply fix by standard method - update via .bin file. It failed with U007 error, so I've found that I should do factory reset and should work... I did it and then found that in the past (few years ago) I did trick to prevent updates (rename folder in the Kindle shell).

I have K4NT where I unable to apply any hack (specially USBNet to modify the folder on the Kindle shell).
Tried Kubrick, but on my home PCs is not working (java error, exit and EXIT commands doesn't fix the issue with java error).
Then I tried to use diag boot (when I choose USBNet from menu and apply config on my Linux machine I'm able to ping the Kindle IP: 192.168.15.244, but device not accepting SSH connection


To sum up I can't install any hacks apart of Jailbreak. My PCs are running Linux.
Is there any option to get SSH access to kindle to rename directory that will allow me install hack by .bin files.

Thank you in advance!