Today I occasionally flashed the “living room” with the bedroom code (forgot to change the device)
After selecting “living room” device, I can’t flash it with the living room code anymore. I made no changes to the code, but today in Web IDE I’m getting:
Error: Could not compile. Please review your code.
I tried to flash standard BlinkLED example - it worked. However my code still Could not be compiled.
For the Core you can still perform a factory reset
Then do the stuff outlined in the post you linked above and see if it works again (should run Tinker again).