Puck.js and SIM 800L module unable to initialize after cutting and restoring power

Thanks for trying all that and for posting up the photo - that really helps.

Could you try sending the above code with 'save on send' set to 'direct to flash', and replace Bluetooth.setConsole(1); with:

var log="";
LoopbackB.on('data',d=>log+=d);
LoopbackA.setConsole();

Then after you reset, power on, and waiting a bit do print(log) and see if it says anything - it should show you if there were any error messages displayed.

Also, do you have a lithium ion battery available that you could use as a power source? I've had a lot of issues when trying to power SIM800 off of mains adaptors. It draws huge peaks of current when trying to connect to GSM and mostly they really struggle supplying enough power and then the SIM800 bottoms out. A LiPo battery can pretty much always supply enough instantaneous power though - they fact that it's a bit below 5v isn't usually a problem.