RPI 3 B+: console=ttyS0 not working while booting / need a development guide.

[seurat]

Hi *,
I just booted a new RPI 3 B+ with ZeroShell and can’t see output on my serial console.
I changed the Slot-1 boot parameters to use serial38400 but find the kernel boot is being set to console=ttyS0. when I change this manually to console=serial0 it works well.
I tried changing the slot_mkgrub, slot_mkuboot and inst-manager CONSOLE= line to use “console= serial0..” but find that these are overwritten by the ISO image after every boot.
As I have a need to make changes the wifi-manager script so my AP configuration can use 802.11ac with 80MHz BW.
Where can I find a comprehensive guide on how to set up a development environment?

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