Created Memory write error, use debug for more info (markdown)

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+In rare circumstances, your keyboard/device can become unwritable, and dfu-programmer will give you an error like this:  
+
+    Erasing flash...  Success
+    Checking memory from 0x0 to 0x6FFF...  Empty.
+    Checking memory from 0x0 to 0x607F...  Empty.
+    0%                            100%  Programming 0x6080 bytes...
+    [ X  ERROR
+    Memory write error, use debug for more info.
+
+Currently the only way to solve this is to [reprogram the chip via ISP](https://www.reddit.com/r/olkb/comments/4rjzen/flashing_error_on_mac_os_x/d52rj8o/). This requires another device to be hooked-up to a couple exposed pins on the PCB. There is a guide on how to do this [here](https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader), and [this is where things are on the Planck PCB](http://imgur.com/lvbxbHt).
+
+An example command to flash the board once things are hooked up is:
+
+    avrdude -c usbtiny -p m32u4 -U flash:w:planck_default_rev4.hex
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