yes, i get the idea, i've even tried with browsers both internal and external, but samsung enginneers blocked all the possibilities,
it's interesting they blocked this folder in f480 and 490s the situation may be caused due the fact that they have only touch sreens and no physical keyboard, so they were affraid of software freees in case of using normal apps
unlocking folder has nothing to do with warranty
flashing your phone may void it, but if you have your soft ande flash it to another you can always reflash it when something goes werong back to your soft (but you must have it first)
the final thought, after dealing with z400 firmware vodafone had the best and the most changed one, so i wouldnt be supprised if it was the same case here, but i wouldn't count on locking the phone, on voda firmware it had more useful options as full screen video,m 4 alarms, dif calc, and java acces to files built in