Why does my jailbroken iphone 4 keep freezing then restarting?

I recently jailbroke my iphone 4.before i jailbroke it i noticed that i had no storage when i only had 7 songs, 8 downlodable apps, and 37 pictures. After constantly tying method after method to get more storage i decided to just completly restart my iphone and erase everything. It was taking oddly long to restart so my brother somehow canceled the restart and tried erasing my whole phone by the option in settings. I was relieved to see my lock screen pop up but i noticed it had the same picture as i had set it to. But all my memory was suppose to be erased. So i typed in my pascode to unlock my phone and it just froze… And after about 40 seconds it turned off and showed the apple sign as if it were turning on. When it turned on again i tried typing my passcode again and the same thing repeaded. I have tried holding the home button and the sleep button to restart it but the same thing happened. I even tried holding the volume up button while it restarted but nothing worked.

If you used evasion to jailbreak it, you can't restore or update it. It will brick

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