@sebar said in SD card not booting in Zero W, in 3B it does:
Why insist on this old System? It contains tweaks, which I am not able to reproduce.
We don't support 3rd party systems, we don't know how they've been configured and set-up.
Your image has a special kernel, which might as well not work on a Pi 0 if it was optimized for the Pi3 CPU.