diff --git a/docs/device/usb.md b/docs/device/usb.md
index 9964ffb0..1872f24f 100644
--- a/docs/device/usb.md
+++ b/docs/device/usb.md
@@ -69,7 +69,7 @@ Select **Save File** and then select **OK**.
 The file will then appear in your downloads in the top right of your browser.
 Click the **folder icon** next to the filename to open it in Windows Explorer.
 
-![](/static/mb/device/usb-windows-firefox-2.png)
+![](/static/mb/device/usb-windows-firefox-2.jpg)
 
 Drag and drop the `.hex` file from the download folder onto the `MICROBIT` drive.
 
diff --git a/docs/static/mb/device/usb-generic.jpg b/docs/static/mb/device/usb-generic.jpg
index b7841e39..13a782b7 100644
Binary files a/docs/static/mb/device/usb-generic.jpg and b/docs/static/mb/device/usb-generic.jpg differ
diff --git a/docs/static/mb/device/usb-mac.jpg b/docs/static/mb/device/usb-mac.jpg
index c2882d81..8b6af443 100644
Binary files a/docs/static/mb/device/usb-mac.jpg and b/docs/static/mb/device/usb-mac.jpg differ
diff --git a/docs/static/mb/device/usb-osx-chrome.png b/docs/static/mb/device/usb-osx-chrome.png
index 2de35823..b4533195 100644
Binary files a/docs/static/mb/device/usb-osx-chrome.png and b/docs/static/mb/device/usb-osx-chrome.png differ
diff --git a/docs/static/mb/device/usb-osx-firefox-1.jpg b/docs/static/mb/device/usb-osx-firefox-1.jpg
new file mode 100644
index 00000000..eea0fad3
Binary files /dev/null and b/docs/static/mb/device/usb-osx-firefox-1.jpg differ
diff --git a/docs/static/mb/device/usb-osx-firefox-1.png b/docs/static/mb/device/usb-osx-firefox-1.png
deleted file mode 100644
index 4841e774..00000000
Binary files a/docs/static/mb/device/usb-osx-firefox-1.png and /dev/null differ
diff --git a/docs/static/mb/device/usb-windows-firefox-2.jpg b/docs/static/mb/device/usb-windows-firefox-2.jpg
new file mode 100644
index 00000000..416e42ed
Binary files /dev/null and b/docs/static/mb/device/usb-windows-firefox-2.jpg differ
diff --git a/docs/static/mb/device/usb-windows-firefox-2.png b/docs/static/mb/device/usb-windows-firefox-2.png
deleted file mode 100644
index 98eb0f2e..00000000
Binary files a/docs/static/mb/device/usb-windows-firefox-2.png and /dev/null differ
diff --git a/pxtarget.json b/pxtarget.json
index 3fee1f0d..f7d9bd73 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -266,61 +266,61 @@
                 "name": "connection",
                 "os": "*",
                 "browser": "*",
-                "path": "/doccdn/static/mb/device/usb-generic.jpg"
+                "path": "/static/mb/device/usb-generic.jpg"
             },
             {
                 "name": "connection",
                 "os": "mac",
                 "browser": "*",
-                "path": "/doccdn/static/mb/device/usb-mac.jpg"
+                "path": "/static/mb/device/usb-mac.jpg"
             },
             {
                 "name": "save",
                 "os": "windows",
                 "browser": "firefox",
-                "path": "/doccdn/static/mb/device/usb-windows-firefox-1.png"
+                "path": "/static/mb/device/usb-windows-firefox-1.png"
             },
             {
                 "name": "save",
                 "os": "mac",
                 "browser": "firefox",
-                "path": "/doccdn/static/mb/device/usb-osx-firefox-1.png"
+                "path": "/static/mb/device/usb-osx-firefox-1.png"
             },
             {
                 "name": "save",
                 "os": "mac",
                 "browser": "chrome",
-                "path": "/doccdn/static/mb/device/usb-osx-chrome.png"
+                "path": "/static/mb/device/usb-osx-chrome.png"
             },
             {
                 "name": "save",
                 "os": "windows",
                 "browser": "edge",
-                "path": "/doccdn/static/mb/device/usb-windows-edge-1.png"
+                "path": "/static/mb/device/usb-windows-edge-1.png"
             },
             {
                 "name": "save",
                 "os": "windows",
                 "browser": "ie",
-                "path": "/doccdn/static/mb/device/usb-windows-ie11-1.png"
+                "path": "/static/mb/device/usb-windows-ie11-1.png"
             },
             {
                 "name": "save",
                 "os": "windows",
                 "browser": "chrome",
-                "path": "/doccdn/static/mb/device/usb-windows-chrome.png"
+                "path": "/static/mb/device/usb-windows-chrome.png"
             },
             {
                 "name": "copy",
                 "os": "mac",
                 "browser": "*",
-                "path": "/doccdn/static/mb/device/usb-osx-dnd.png"
+                "path": "/static/mb/device/usb-osx-dnd.png"
             },
             {
                 "name": "copy",
                 "os": "windows",
                 "browser": "*",
-                "path": "/doccdn/static/mb/device/usb-windows-sendto.jpg"
+                "path": "/static/mb/device/usb-windows-sendto.jpg"
             }
         ]
     },