Issues with Boom Beach and Clash of Clans
Apps such as Boom Beach and Clash of Clans use Game Center by default, the only way to force it to not use the Game Center account is to temporarily sign out of Game Center then start the app after a clean install. If your old account was not bound to either Facebook or Game Center, there is no definite way to recover it, but you can try by following these steps: http://clashofclans.wikia.com/wiki/Recovering_a_lost_village_that_wasn%27t_linked_to_GC_or_GPlus