I have a belgian itunes store account, but once, i connected on the US Store, using my friend's account (he's in the US, and he told me his password so that i could get apps from the US store). Now, when i want to update apps (from the belgian store), a box appears with my friends email, and i have to enter the password, but the thing is i want to use my itunes store account. But i can't change the email, so i can't update the apps with my account. I've tried to log out and log in again, to respring, to reboot, but none of these steps helped. Could anyone help please?