NodeMCU not responding AT after blink app I've just bought NodeMCU LoLin ESP8266, I tried to send AT commands (after spending days on ESP8266-01) and everything was okay. Than I've uploaded the Blink example to the board, after that moment it's not responding to any command.

I tried to update firmware, it's updating successfully but nothing has changed. By the way blink app is not working also...
If you replaced AT firmware in esp8266 with Blink and you want it back, download the AT firmware from Espressif download page and flash it with the Espressif Flash Download Tool (Windows) or with esptool.py.