PW USBnet install / ssh access

Hi Kindle Dev Community,

I have successfully installed jailbreak on my Kindle PW (after downgrading to 5.3.3). Now I would like to get ssh access via WiFi and understood that I should install the usbnet hack for this. It seems, that I did not succeed, for I cannot connect the device per ssh, using a Linux client. (Wifi connection of the device is established - it seems not to respond to pings, though).

What I am trying to do:
from kindle-usbnet-0.22.N-r18981.tar.xz I copied Update_usbnet_0.22.N_install_touch_pw.bin to the device's root. After disconnecting USB I expect to find an update through HOME->Menu->Settings->Menu, but no avail (update entry is grey).
When I reconnect USB, the .bin file is gone.

Did I miss something?

(What I also tried: I installed KUAL-v.2.7.29 and mrinstaller-1.7.M, because I thought they might be needed, too - but this did not help...)

Would be glad if anybody could help!

Thanks in advance!