Comments on Profile Post by drfirew

The flickering is as if it is being programmed but after waiting for long minutes and minutes, this doesn't stop at all, so this is actually not being programmed.

Turned all powers off and reconnect all cables and tried to power on the board, but there is only the 5V green LED, this time this is from 24V reaching the board. Other than that no LED of the motors is on, lifeless. Universal GCode sender, connects to the port but grbl information is not replied.

Help, please.

Seems your flashing failed which may be software or hardware. You need to unplug everything and only power it through the ISP or USB socket during flashing. According to this https://github.com/Spark-Concepts/xPRO/wiki/3.-Updating-GRBL-Firmware you can program it via the USB port as an Arduino Uno.

If you have flashed directly through the ISP port before you will have to do that again because that will overwrite the bootloader that allows USB port flashing.

The critical thing when flashing a /hex/ are the fuse settings, getting those wrong even a little bit can make it freeze up. Plenty of web sites detailing how to unbrick an Atmega328p so just Google it.

Dear David,

I have tried to flash it through USB using XLoader, and the 5V LED light on and USB LED flickers as it would when flashing. But, XLoader says "Uploading", but this never stops. Flickering USB LED for long minutes and minutes, very strangely.

I will google the unbricking and let you know here the result.

Thank you.