demo: https://x.com/adtac_/status/1820127470613622950 (Paperwhite 3)
mobileread.com is your best resource here, follow the instructions from the LanguageBreak thread
I didn't really follow the LanguageBreak instructions because I didn't care about most of the features + I was curious to do it myself, but the LanguageBreak github repo was invaluable for debugging
it doesn't matter how you jailbreak your device as long as you get to a root shell somehow
I wrote a Go program to receive files on port 8000 and then invoke eips, which is Kindle's built-in utility to draw images on the screen
for example, if the Go program received a JPG file and saved it under /tmp/img.jpg, the following command would draw the image with a partial update (full update looks awful):
eips -g /tmp/img.jpg -w gc16 -x 128 -y 0read the eips wiki for details on what the flags mean
unfortunately I lost the Go source code, but it was pretty simple, like under 30 lines
I wrote a script to use screencapture on macOS to repeatedly capture the screen into a png file, which is then converted into a shape, size and color the Kindle likes, and then transferred over usbnet
/usr/sbin/screencapture -C -x /tmp/orig.png
magick /tmp/orig.png -rotate 270 -resize '810x1448!' -type GrayScale -depth 8 -colors 256 /tmp/gray.jpg
cat /tmp/gray.jpg | nc -w 0 192.168.15.244 8000change the resolution to match your device and port to match the listener server