Restore kindles into no-ads mode, whispertouch and screensaver work with koreader

(Not sure why this thread disappeared during yesterday. If it broke the forum guideline, please kindly let me know. Thank you)

I am still evaluating whether this solution can permanently restore the devices into no-ads mode. But it works for now.

I always would like to use whispertouch in koreader, but there are always some tech restrictions if the device is ad-supported ($20 cheaper).

Recently I got a new kindle basic 10th and since I do not purchase ebooks from amazon, I did not see a point of registering it with my amazon account. After setting thing up, I noticed there is no ad on the device, koreader's screensaver works just fine.
It gave me some ideas that kindle firmware changes some settings on-the-fly based on account it associated. So I deregistered my voyage from amazon. But the ads still showed up and whispertouch did not work after suspend.

After searching around and comparing two devices, I noticed
returns different values on two devices. Kindle basic returns
but kindle voyage returns
The ad_screensaver is pretty suspicious. So I ran
on my voyage. It brought my voyage back into no-ads mode. Everything started working, koreader screensaver, whispertouch.