Samsung G531f

I Received to repair one Samsung G531F , my client tell-me the Phone previously Is working fine , but he goes to recovery mode to do a hard reset, after that the Phone crash at start, he contacted-me , i put Phone in download mode and flashed without error but continue the same problem, i power Phone , motor have a vibration 1/2 minutes Phone restart , i have checked and i cant enter in recovery menu, o try many times vol+ , Home and power but no sucess to enter recovery , any ideia to solve this ?