Search for "HcH Uberoid WM8850 v12" (or latest version available).
For build W70-1.5.1680-WIN8-1108 , files are often shared on Android Tablet Forum . 🛠️ Installation Instructions eken+w70+v20+wm8850+firmware+link
firmware, and using the wrong one can permanently brick the device. Guide for Updating Firmware on EKEN W70 V20
Installing the wrong firmware "version" (e.g., using a V10 firmware on a V20 board) can lead to a or broken touchscreen functionality. If your touchscreen doesn't work after flashing, you likely need a different kernel image or a specific "change-id" in the firmware configuration. eken+w70+v20+wm8850+firmware+link