Informations and Example code to control the GICISKY / PICKSMART E-Paper Shelf Labels
Web Bluetooth Uploader can be found here: https://atc1441.github.io/ATC_GICISKY_Paper_Image_Upload.html
You can find the 4.2" Demo File in this repo
For newer models with TLSR SoC this flasher can be used to flash a custom firmware, use with caution!: https://atc1441.github.io/BLE_EPaper_OTA.html
This repo is made together with this explanation video:(click on it)