I've been trying to bypass the Google Account credentials on a Samsung S4 I was given (it had already been factory reset) and, following the instructions in this answer, I inserted a USB drive via the OTG at the Google Account notification - but nothing happens! ie, no, popup or new page, just the annoying 'This device was reset etc' page and the unhelpful option to enter an email.
What can I do now to access the APK from RootJunky?