Enter the number you see in the Network tab for the failed redirect (should look something like 1342108893269 for instance):
Enter the DOH mobileRunner.html URL you want to test (note the loaded plugin at the end):
Press
The test should momentarily start (after ~10s) on the device (if it doesn't load after a minute, repeat the procedure; some times an unbuilt Dojo will time out while the browser is caching everything for the first time.)