Update developing.md

app/developing.md

@@ -31,6 +31,6 @@ If you are able to create debug logs and create Issues feel free to subscribe th
 
 **OR**
 
-* Use [this file](card10-ios-branch.bin) and transfer it as *card10.bin* over USB to your card10 
+* Use [this file](https://git.card10.badge.events.ccc.de/card10/logix/blob/master/app/card10-ios-branch.bin) and transfer it as *card10.bin* over USB to your card10 
 
 [![https://testflight.apple.com/join/oqZhY70M](http://api.qrserver.com/v1/create-qr-code/?color=000000&bgcolor=FFFFFF&data=https%3A%2F%2Ftestflight.apple.com%2Fjoin%2FoqZhY70M&qzone=1&margin=0&size=400x400&ecc=L)](https://testflight.apple.com/join/oqZhY70M)