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<p><font face="Candara">Not sure if this will help</font></p>
<p><font face="Candara"><a class="moz-txt-link-freetext" href="https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/troubleshooting-and-faq#faq-vid">https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/troubleshooting-and-faq#faq-vid</a></font><br>
</p>
<br>
<div class="moz-cite-prefix">On 19/01/20 12:28, Mark Atherton wrote:<br>
</div>
<blockquote type="cite"
cite="mid:b1d79cdb-11c8-f3a1-9965-3bb723131925@xtra.co.nz">Just
compiled an Arduino LoRaWAN demo sketch, and programmed it into a
SparkFun SAMD21 Pro RF.
<br>
<br>
Post programming, the blue LED appears to be on (or flashing
fast), and the Arduino IDE is no longer able to find/program the
unit.
<br>
<br>
Win7 Device Manager reports the USB device under 'Other devices'
"Sparkfun SAMD21 Pro RF" with a VID of 1B4F, and PID 214F there is
also a yellow exclamation point indicating that the associated USB
drivers have not been installed.
<br>
<br>
A search of the web indicates that the bootloader has been
corrupted, but I am surprised that the hardware can still
enumerate a USB device - mind you, I know nothing about this
processor.
<br>
<br>
-----
<br>
<br>
So the short-and-sweet question: anyone seen/fixed this issue
before, it seems like a popular way of bricking these (expensive)
boards.
<br>
<br>
I have found the bootloader hex/binary, and fetched a copy of
Atmel Studio (870MB), just need to find a cheap, readily
available, and compatible programmer.
<br>
<br>
Comments please.
<br>
<br>
Regards, Mark
<br>
<br>
<br>
<br>
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