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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.
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.
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.
The rest of the procedure is the same as documented.
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.
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.
When you try to use the device for anything that the manufacturer does not describe as its intended function, your on your own (with whatever help you can find other than the manufacturer).
Your failure so far to do that is not the fault of the Kindle or of Amazon.
Try your own alternate solution.
It will not be as easy as you imagine and it is unlikely to work.
There are too many hardware details unknown to you for you to even suggest it.
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.
"Should" according to your own definitions.
Lots of luck on your next attempt to use Kindle parts.
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