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Danger! This post is a dircet answer to knc1. It is off topic and long. But I cannot accept the attacks knc1 addresses at me. So if you don't want to be involved, pleas skip this article.

Originally Posted by knc1

You do not need the serial port to downgrade a jailbroken kindle.
You only need to install RP (Rescue Pack) and use it.
Start with the sticky thread with "Where do I start?" in its title.
You will find out how to manually install a different main OS.

Ok, I will try to find and use it. I read that thread but maybe overread some thing. There are several thousands of articles in this forum. Sorry that I cannot read all of them yet.
And about searching: it is sometimes difficult to find the right search words, esp. if english isn't your mother language.
I never understood why people in forums often are so repellent if someone askes a question which is somewhere answered already. If they are so embaressed about the question, they should simply not answer, but blocking a thread for others that are not so embaressed.

The fact that you couldn't find it does not prove that it isn't there, you can't prove a negative
All you proved is that you could not find it.

That is quibbling (hope that is the right word). I never said it isn't there. I only say I didn't find it yet and that is the truth.

If you refuse to use RP, then you can use the serial port.
Only the specifics of the switching from 'main' to 'diags' and back again is slightly different.

I don't refuse it, I only didn't read all the stuff. And I thought it may be interesting to find out WHY it isn't working with that new FW version. But I see, that is to complicated for me. So I simply asked if anyone knows how to proceed in finding out.

Your claim that the hardware wakeup does not work is also false.
You can't prove a negative.
All you have shown is you can not find how to make it work.

That is quibbling, too. I think you know exactly what I mean. Ok: the known methods of activating a wakeup call using the RTC does not work with the new FW. And I didn't find it yet. Is that better.

Please provide a link where the manufacturer (Amazon) claims that your Kindle can be used for the 'simple' use you intend to use it for.
I am certain you will not be able to find that one either.

Why should I. I understand that Amazon is not interested in letting people "missuse" their device. That's ok for me. But that they force me to update MY device is NOT ok for me. It's all and everywhere the same today. The producer of some goods forces the owner of the good to do this and that and even destroys the good if the want.
E.g. I bought a computer game some months ago. It works flawlessly on my old PC. Until some day stupid Steam forcefully updated it. Now it crashes and I cannot use it anymore. 30 bucks for trash. Nice.
If I knew before buying a product it will be altered afterwards without my approval I would not buy it. But nowaday then I could buy nothing, because all the software producers seem to be the same.

Your failure so far to do that is not the fault of the Kindle or of Amazon.

I does not blame Amazon for blocking other uses, but I blame the for altering MY device without asking me, as stated above.

Try your own alternate solution.
It will not be as easy as you imagine and it is unlikely to work.

Yes that will not be easy. But I see more chances for me. I have a solid know how in hardware things and know how to use a logic analyzer and how to program display controllers and microcontrollers.

But Linux is a mystery for me.

There are too many hardware details unknown to you for you to even suggest it.

Maybe. But maybe it is possible to find out the controller chip of the display or even trace the signals with a logic analyzer. We will see. It would be easier to simply buy am eInk display with known datasheet. But it seems that nowaday the producers of such parts are not willing to sell them in small quantities, so we hobbyists have to reverse engeneer things if we want to use them.

And we have all been able to read how little you like reading (and even following) directions that deviate from your own preconceived notions of what should be required.

Sorry, I don't understand the second part of the sentence. Seems my english is not good enough. And about my "little liking to read" I already said at the top of this post that it is a simple matter of time. I cannot read all the thousands of articles at the same time. And what you mean with "directions that deviate my own preconceived notions" is a to complicated sentence which I simply don't understand.

I think this thread is dead now because of our misunderstandings and blaming each other. I am very sorry for that. Maybe it's the language differences, maybe I missunderstand some of the meanings of this conversations. Maybe I should only post in forums that are in my motherlanguage german.

I will not waste more time in asking something and try to find out by myself. As knc1 said: it's all here (hopefully). I only have to find the "needle in a haystack". It should be a joyfull weekend project. But now I am too annoyed to preceed. May be later.