Thank you all for the answers! Additionally I have noticed that even the valid update packages are being deleted after being processed.
I have done the jailbeak, also installing the other packages as per
https://www.mobileread.com/forums/sho...d.php?t=232290 down to point no 17 where it says that I need Linux computer. But I do not know if appropriate to continue since I intend to use the wifi connection very frequently, but I am also interested in preventing data exchange with Amazon.
The KUAL Launcher is great, although as Windows user I was expecting a dropdown window from the Home or Menu icons for accessing the programs. Not all the extensions are working that I have downloaded from the twobob post #3 on
https://www.mobileread.com/forums/sho...d.php?t=203326. Wii have to try those applications listed under twobob post #1.
One other remark after the jailbreak is that the display light does not come optically to zero, even if the cursor on the scale is at zero. I was expecting complete extinguishing. Is this correct?