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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
Research is still being done on why this happens, but here are some cases:
* [`make -f Makefile.rn42 dfu` and not the dfu-programmer commands worked for @tybenz](https://github.com/tmk/tmk_keyboard/issues/316) - also see [the hhkb keyboard on tmk](https://github.com/tmk/tmk_keyboard/tree/master/keyboard/hhkb)
* [Doing a force erase works here](https://geekhack.org/index.php?topic=12047.msg1520147#msg1520147)
* [`dfu-programmer atmega32u4 erase --force` works here as well](https://forum.fhem.de/index.php?topic=29777.0) [DE]
* [Unresolved, but some data dumps](https://github.com/dfu-programmer/dfu-programmer/issues/29)
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