its on my ipad , i did hard reset 2 time but the badge is still there , i read that signing out of icloud should help , but it says that it will delete all my data
It's probably an iCloud storage limit warning. Have you reached your limit?
If that's the case, you'll need to offload/delete media off your phone and re-sync or upgrade your iCloud storage tier to get rid of that badge.
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its on my ipad , i did hard reset 2 time but the badge is still there , i read that signing out of icloud should help , but it says that it will delete all my data
Correct me if I'm wrong but I believe it'll only delete it from your iCloud and not your device. When you resign into iCloud, it should re-sync/upload your devices contents back to it.