I use du speed booster on my s2 and I've never had a problem with it :) it works really well. The advanced cleaning option is also very handy.
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i posted this question, then decided to make an account. would it be an android issue or a samsung issue? i have been trying to find a list of what each of the options on the sysdump menu actually do, but have had no luck. i think my friend may have accidentally hit another option as he was...
i have done this repeatedly on my samsung S2 with no problems at all, but i showed a friend how to do it on his S4, and he reckons he has lost some applications and has been locked out of his phone! anyone know why that could be?