What is zbs_flasher?

ZBS_Flasher is a tool that lets you rewrite the software on electronic shelf labels, those small e-ink price displays you see in retail stores. These labels are made by a company called SOLUM and contain a tiny chip called the ZBS243 (also rebranded as SEM9110). Normally these labels run whatever software the manufacturer put on them, but this project gives you a way to read and replace that software with your own. You connect a small microcontroller board (like an ESP32 or Arduino Nano) to the shelf label using a few wires. The board acts as a bridge between your computer and the label's chip. You run a Python script on your computer that sends firmware files to the board, which then writes them onto the label. The connection uses a few pins for data and one pin to control the label's power, because after each write, the chip needs its power cycled to get out of debugging mode and back to running normally. The main audience is hobbyists and tinkerers who want to repurpose electronic shelf labels for their own projects. For example, if you wanted to turn a store price tag into a custom display for your smart home, a weather station, or a mini dashboard, this is the tool that makes it possible. The project includes pinout diagrams for different label sizes (1.54 inch, 2.9 inch, and 4.2 inch) and even has a 3D-printable programming jig to hold the connectors in place. The project also includes some experimental debugging features. You can dump the chip's memory to see what's stored there, send serial commands through the connection, or clear the label's screen while it's still running its original software. These are rougher features and may not always work reliably. One thing to note: the README warns that you shouldn't connect the chip's power directly to a pin on your board, you need a transistor or switch in between, or you risk damaging things. A full flash write takes about 12 seconds with an ESP32, and the tool verifies the data after writing to make sure it landed correctly.