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Topic: [SOLVED] Bricked MKR WAN? (Read 655 times) previous topic - next topic


Aug 08, 2018, 07:30 am Last Edit: Aug 09, 2018, 02:23 pm by MITEL
Hi, I am almost new to Arduino, although in the last weeks I did more or less what I wanted with it, until yesterday.
I have a MKR WAN 1300, and I use the IDE on a Mac (High Sierra). After having attempted to load the LMIC library instead of the original, the serial port disappeared (I suspect due to a conflict in pins configured on LMIC, which likely is not supposed to run on a MKR. Don't ask me why I tried).
I tried almost all the workarounds for missing serial ports on a Mac, with no success (change port, cable, reboot, reset PRAM). I tried the loopback test but since there is no serial, I could not do it really.

However, when powered, the Arduino remains with both leds on (green and yellow).
Is this the case where I have to reload the bootloader with ArduinoISP?

Thanks for your help.


Ok, some update: I decided to reinstall the bootloader using another MKR (1000).
This one is recognised by the IDE, so serial is available, I tested it with usual blink sketch, and then uploaded the ArduinoISP sketch. However, carefully following the steps described here, when I choose "Burn bootloader", an error appears:

"Please select a programmer from Tools->Programmer menu".
Arduino as ISP is of course selected in the programmer menu.

I also installed the 3 leds managed by the sketch (however, on different pins because the ones suggested are in part used by MISO MOSI SCK). The 3 blink sequence in the setup is ok, the heartbeat is present.

So, I am still in need of help. Or tell me that there is nothing to do, and I will let it in the drawer :)


Aug 09, 2018, 02:25 pm Last Edit: Aug 09, 2018, 02:28 pm by MITEL
I finally found here a workaround: quickly double tapping the reset button. The serial port reappeared, and I was able to upload a sketch. Happy now.


Thanks. You just saved me a lot of grievances. :-)


The arduinoIsp sketch will only allow you to put bootloaders on AVR chips, not the Sam chips used on the MKR boards.

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