@NiLuJe:
I understand the confusion, my bad... I mean that the KT4 2019, shipped with the 5.11.2 version. Unfortunately, I don't have the 5.11.2 image. Otherwise, you'd already get a PM with more details
I think that I have enough experience to do the operations through serial.
I even purchased the KT4 to use it as a development board with 6'' Eink Carta 1.2, touch, front light, i.MX6 SLL (integrated EPDC), additional WiFi and Bluetooth, battery and battery management, etc...
Alternatives were way too expensive and Eink doesn't even sell through their webshop to individuals.
Basically, you get all this for less that $90 USD (buy 2, 10% off... $81), had a friend bring it from the US to Europe.
So I already disassembled it, and found mobile read developer's corner
Then I though, for the first simple things that I want to do, why not use the jailbrake and reuse what the amazon team already developed, and what you guys did. Anyway, I cannot get the waveforms, and it's a big question mark about the driver itself...
So, now, I want to try NiLuJe/FBInk... but I still cannot
Don't have much time next few days, but upcoming weekend and next week... should have enough time to play around (serial, downgrade, boot from serial, etc...)
My goal is to setup Yocto from scratch and use the KT4 as development environment, but don't plan to start there.
The PW4 is something I use for reading, love to read, and update the devices as they come out....
You guys really impressed me, some really great stuff to find here!