Hi,
I followed the troubleshooting for a bricked Pro Micro 3.3v but nothing seems to happen. I short the rst and gnd terminals on board as instructed but nothing seems to happen. The port selection under Tools is still greyed out and everything I try complains that it can’t find the port. I attempt to change the port and/or upload my code within the 8 secconds after shorting rst and gnd twice but again, no difference. Any help would be appreciated. Thanks so much!
Did it ever work ? Perhaps the issue isn’t with the Pro Micro but with the USB connection or configuration on the PC side.
I have a bunch of those and have mistreated several of them quite badly with bad connections, shorts, mis-applying power, etc. and haven’t bricked a single one yet.
Hi
Thanks so much for the response.
No, the Pro Micro card has never worked. I wouldn’t know where to begin to diagnose the issue with the USB port. Any guidance would be appreciated. The port does work fine with my dongle for a wireless trackball if that’s helps the prognosis. Please let me know your thoughts. Thanks again. Greatly appreciated!
Do you have a multimeter to check the voltage on the Pro Micro board to see if it is getting 3.3v power, and do you see an LED when you plug it into the USB?
If you plug it in and open the Arduino IDE, then try to assign the USB port do you see it in the dropdown list? Are you using Windows or Linux (both have different methods to examine a USB port connection). Oh, and try another USB port and another USB cable, that might also be a possible source for the error.
Hi,
Thanks again for the response. Sorry for the delay in mine 
I do have a mulitimeter. Which terminals do I use to check for voltage.
Yes, the LED is constantly lit when the Pro Micro is plugged in the USB port on my laptop.
I’m running Windows 10.
I checked another USB cable, no difference.
The laptop only has one fullsize USB port. The others are USB-C used for charging and something else.
Please let me know your thoughts. Thanks!
On Windows, plug in the board and do a right-mouse click on the Windows symbol and choose “Device Manager”. Under “Ports” you should see your pro micro as “Arduino Micro (COMn)”. If you see it then the Micro isn’t bricked. On the breakout board, measure the voltage between “VCC” and one of the “GND” pins, that should be 3.3V, and between “RAW” and “GND” should be 5V.
Hi,
Thanks again for hanging in there with this. First the good news. VCC - GND is 3.3 V and RAW - GND is 5V.
The not so good news is that “Ports” is not an option under Device Manager. I did at one time try to look around for the port as it was mentioned as needed to be set or confirmed in all the documentation I read online. I could not find a anywhere on my system that mentions COM or USB ports.
The closest item under Device Manager is “Universal Serial Bus Controllers” and under that, the choices are:
Intel USB 3.0 eXtensible Host Controller - 1.0 (Microsoft)
Synology Virtual USB Hub
USB Composite Device
USB Root Hub (USB 3.0)
Of those, only USB Composite Device shows port location under properties and it shows “Port_#0005.Hub_#0001”
I can’t see any other choice that might have anything to do with ports and nowhere do I see Arduino Micro mentioned. Any suggestions? Thanks again!
Try the “[How to revive a bricked Pro Micro” section in our hookup guide.](https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide#ts-revive)
I’ve attached a screenshot of the Device Manager to show what it looks like when I attach my Micro.
Do you have another Arduino? If yes, does that work when you plug it into the USB port? If the recommendations in the previous post don’t work, and you have another Arduino, you can use that to program the “bricked” one using ISP. There are numerous guides on the web showing how to do that. On https://learn.sparkfun.com/tutorials/in … loader/all go to the chapter “Connecting the Arduino as ISP to Target” to get an idea of to do that.
TS-Chris,
I hope all is well.
Following those steps was the first thing I attempted. Unfortunately, as stated in my earlier post, I cannot reset the board as shorting GND and RST does absolutely nothing.
I’ll check out the advice by SV-Zanshin below. Thanks though!
The guide says to connect a button to those pins and then double click the button to get into bootloader mode. Simply shorting reset to ground isn’t going to work.