diff --git a/docs/device/usb.md b/docs/device/usb.md
index 3efd5e81..d2c31af2 100644
--- a/docs/device/usb.md
+++ b/docs/device/usb.md
@@ -73,9 +73,11 @@ Click on **Download**. You will see a message “Do you want to save this .hex f
 
 ** Safari**
 
-When you select **Download** in Safari on Mac, your file will be downloaded to your downloads folder. Go to your downloads folder and open the file. In Safari the file will appear as unknown.txt rather than a named .hex file. Drag and drop it onto your MICROBIT drive.
+When you select **Download** in Safari a file called `Unknown` will be
+downloaded into your Downloads folder. Open your Downloads folder and drag and
+drop the file onto your `MICROBIT` drive, under Devices:
 
-![](/static/mb/device/usb-4.jpg)
+![](/static/mb/device/usb-4.png)
 
 **Firefox**
 
diff --git a/docs/static/mb/device/.DS_Store b/docs/static/mb/device/.DS_Store
new file mode 100644
index 00000000..5008ddfc
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diff --git a/docs/static/mb/device/usb-4.jpg b/docs/static/mb/device/usb-4.jpg
deleted file mode 100644
index 865c4247..00000000
Binary files a/docs/static/mb/device/usb-4.jpg and /dev/null differ
diff --git a/docs/static/mb/device/usb-4.png b/docs/static/mb/device/usb-4.png
new file mode 100644
index 00000000..bb56a04e
Binary files /dev/null and b/docs/static/mb/device/usb-4.png differ