By Ibraam Nasif, 29 September, 2021 Forum iOS and iPadOS hello dears i've iphone 7, now latest ios14 didn't install v15. please, which app i could use to clean temps and free storage, also, chick battery helth / calibration? which routine you recommend to obtemize device performance. thanks Options Log in or register to post comments Comments restart Do a force restart. That will clear ran and if you go to setting, safari and clear history will clean your browser if you use it.