Tasmota on Sonoff S31 using NodeMCU

Disassemble: Remove grey Cap with spooger (or equivalent), then unscrew three obvious screws, slide out 'slides', pull off cover
Attach Serial Communication Cables ( x 4), from closest top corner of PCB: VCC, RX, TX, skip, skip, Ground (IE that's what's printed on the PCB)
Plug in Serial Communication Device (TTL), but FIRST: "Push the Button Max!" (to put the Sonoff device into 'Flash Mode')
Start NodeMCU: Set Serial COM Port, Select .bin file, Dual Output (DOUT), yes, wipes all data
...wait
Unplug Serial Communication Device and plug it back in (IE, restart / reboot Sonoff / Tasmota device), no need to plug it into 120V, power comes through Serial Communication Device.
Look for Tasmota (or maybe Sonoff for older firmware) with a WiFi Device (Computer or Phone or Whatever) and connect
Most devices will automatically open a Browser window, if not, look for WiFi IP Address and associated Default Gateway (should be the Sonoff / Tasmota device), navigate to that IP Address (192.168.4.1 on newer firmware, as of 01.2025).
In Web GUI for Sonoff / Tasmota device, connect to a WiFi Network
If Sonoff / Tasmota device connects successfully, it should display new IP Address (of local WiFi network Sonoff / Tasmota device is connected to) and should then redirect to that same IP Address. Whatever WiFi Client Device was connected to Sonoff / Tasmota device will be disconnected.
TIP: If moving a Sonoff / Tasmota device to another "LAN", it is usually safer to configure the "new LAN's" WiFi Access Point (if using something like OpenWRT) with the Sonoff / Tasmota's 'previous' WiFi AP SSID and Password, then reconfigure the Sonoff / Tasmota to connect to the new WiFi AP
OR, configure the secondary WiFi AP info (SSID / Password) within the Tasmota / Sonoff GUI.

Tasmota on Sonoff S31 using NodeMCU

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