(adsbygoogle = window.adsbygoogle || []).push({}); My brother, who I know, accesses my PSN account with PS3 (CFW) trophy sync and PSN store.

If this happens, will my account be suspended after a few days? (BAN)

Here is your answer. I did jailbreak my ps3 and after a few days on Friday 15 I got permantly ban so I lost eveything. Well I got most of my saves to a USB so I can see if I buy my games back again or borrow them from someone but like COD WW2 I lost all my progress and supply drops. If you have the games download on your ps4,vita or ps3 without CFW. You can use them on a new account while your account is primary on those devices.
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It depends, I have the same account and I've modding trophies since 2012 and I never got banned, using WebMan to delete history and disable CFW will probably make your account not get banned, if you does not use nothing to protect your account you'll probably get banned.

Yeah I literally only sign in and sync trophies with a CFW console never been banned...I refuse to do anything else online with it.