ZitaoTech/Hackberry-Pi_Zero ? reverse-engineered prompt

I want to build a clear, polished guide for this handheld Linux terminal project so someone can follow it and assemble the device themselves.

Please make the repo easy to use as a complete build and setup reference for a Raspberry Pi Zero 2W powered handheld with a 4 inch square display, BlackBerry style keyboard, dual swappable batteries, USB ports, and I2C support. Organize the important steps so a beginner can understand what parts are needed, how the hardware fits together, how to wire and connect everything, how to install the screen driver, and how to do the basic OS setup for different Linux images.

Also make the keyboard instructions simple, including how to switch between using it in the handheld and plugging it into a computer to change the key mapping. If anything is unclear, look up current docs online if you need to. Keep the tone friendly and practical, and make the finished result feel like a real project someone could actually build from.