Below is the answer I've got in seconds.
"Unfortunately, there isn't a DIY e-reader project that exactly matches your specifications. However, there are some related projects and options you might consider:
The Pi e-Reader project by Guyrandy Jean-Gilles uses a Raspberry Pi Compute Module 4 (CM4) board and an E Ink display4. While this isn't an Android-based solution, it offers customization options and open-source software.
The Microtouch project is an open-source DIY e-reader and mobile media device7. However, it uses an 8-bit processor and a small 320x240 touchscreen, which doesn't meet your 300 dpi screen requirement.
For reusing your old Kindle's screen, there are some resources available:
The Inkplate project sells recycled Kindle displays driven by a programmable ESP323.
The epdiy GitHub repository might provide helpful information for interfacing with E Ink displays3.
Regarding your specific requirements:
4 GB RAM: This is more typical of modern tablets rather than e-readers.
External SD card support: Many Android devices support microSD cards up to 512 GB or even 1 TB5.
Android tablet: Converting an e-reader to an Android tablet is challenging and not common in DIY projects.
If you're open to modifying your requirements, you might consider repurposing your old Kindle's screen for a custom project or exploring alternative e-reader designs. However, creating a full-fledged Android tablet with your desired specifications would likely require significant expertise in hardware and software development."
I would use probably a larger model next time.
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