Node mcu stop working and start blinking on board led

[Zinthos]

I program it with blynk examples using audrino IDE to perform with blynk app
at first it work fine by powering with usb
Then I try to power it from Vin pin and GND with 9v battery after that it's no longer working and not even wiith usb.The Led on the board blinking all the time :@
I can't buy a new one :'(

[Jivansha]

Have you tried resetting the MCU? Try pressing the reset button a few times before uploading again.