PLS HElP my iphone 6 just got hacked !!!!!

hi everyone i have an iphone 6 running ios 9.0.2 and it's jailbreaked 5 mnts ago i did a respring to it and the backround photo has changed with a pic of a boy and there is "HELLO, Hacked" right above his head
pls can anyone tell me what should i do ??

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