[HELP] Samsung Galaxy Duos GT-S7562

my samsung duos is automatically turn on and off..i don't know what to do..one more thing is i tried to hard reset in cwm (not moded cwm) it says successfully but when i turn on my phone the apps that i installed before is still in there..can't flash a moded cwm or twrp it says ''signature verification failed''..i tried to flash stock rom using odin..it says successfuly also but when in turn on my phone again nothings change..i hope you can help me..sorry for my bad english..thank you in advance..

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