Hi,
This morning I powered up my MKR WiFi 1010 in my Opla that I just got in December and now there are two green leds, one on the MKR and on the board itself it's plugged into that are now all of a sudden simultaneously flashing together and it doesn't stop. Now the Opla isn't responding to anything. Unplugging it and plugging it back in does nothing or a reset same thing. If I insert a battery, it activates it and it stops blinking and whatever code is already loaded in it runs, but now it cannot communicate via USB any longer. Seems to me, Com port of dev is shot. Anyone seen this before?
Press and release the reset button on your board quickly twice. You should now see the "L" LED on the board pulsing, which means the bootloader is running. The double press causes the bootloader to run indefinitely (until the board is reset, powered off, or an upload is done), which means you don't need to get the timing of the reset just right.
Select the port of your board from the Tools > Port menu. The port number may be different when the bootloader is running so don't assume you already have the correct port selected.
Start an upload in the Arduino IDE.
The upload should now finish successfully. After this, you should be able to go back to doing normal uploads without needing to press the reset button. If you still need to do the reset trick to do uploads after this, the problem may be caused by your code. You can verify this by uploading a simple sketch like File > Examples > 01.Basics > BareMinimum.