Added how to put device in dfu mode
@@ -16,7 +16,12 @@ The result of your build will be a `.bin`, `.hex`, `.elf` and DfuSe-compatible `
## Uploading to the 32blit via DFU
+### Prepare the device
+
+To enter DFU mode either hold the X & Y buttons and press the reset button or select `dfu mode` from the on device menu. The screen will go dark, this is normal.
+
### Linux and macOS
+
Install `dfu-util` from your package manager then enter:
```
sudo dfu-util -a 0 -s 0x08000000 -D
