It boots into lua, so you should get a prompt (or reset the board by a quick short of reset (top left pin) to GND.
On bootup it prints some garbage first, then says it did not find
init.lua, then gives the prompt (the details are with my fw):
NodeMCU 2.1.0 build dev-20170612-0944-512k-ow powered by Lua 5.1.4 on SDK 2.1.0(116b762)
lua: cannot open init.lua
and you can do things like
1 2 3
[later] I flashed a 1m image and can see these programs loaded:
> t=0;for k,v in pairs(file.list()) do t=t+v;print (string.format("%30s %5d",k,v)); end;print (string.format("%30s %5d","TOTAL",t))
On boot it prints a Temp? It is about 2dC above what I otherwise read here. Anyway, it cannot connect to my a/p yet.
NodeMCU 2.0.0 build dev-20170103-1735-1m-all powered by Lua 5.1.4 on SDK 2.0.0(656edbf)