+If that doesn't work, then you may need to grab the [Zadig Utility](https://zadig.akeo.ie/). Download this, find the device in question, and select the `WinUS(libusb-1.0)` option, and hit "Reinstall driver". Once you've done that, try flashing your board, again.
+
+## WINAVR is Obsolete
+It is no longer recommended and may cause some problem.
+See [TMK Issue #99](https://github.com/tmk/tmk_keyboard/issues/99).
+
+## USB VID and PID
+You can use any ID you want with editing `config.h`. Using any presumably unused ID will be no problem in fact except for very low chance of collision with other product.
+
+Most boards in QMK use `0xFEED` as the vendor ID. You should look through other keyboards to make sure you pick a unique Product ID.
+
+Also see this.
+https://github.com/tmk/tmk_keyboard/issues/150
+
+You can buy a really unique VID:PID here. I don't think you need this for personal use.
+- http://www.obdev.at/products/vusb/license.html
+- http://www.mcselec.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=92&option=com_phpshop&Itemid=1
+
+## Cortex: `cstddef: No such file or directory`