{help} problem auto restart loop - Galaxy Grand 2 General

Hello, I have a Samsung galaxy grand 2 SM-G7102 and have entered automatic restart, that is, it shuts down and when it reaches the logo it restarts and so on all the time.
I tried to enter into the recovery mode but it also restarts and if I enter the download mode it also restarts.
I tried another battery just in case it was not enough current but with another battery also restarts.
I have no idea how to fix it, I hope your advice.

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bootloop..! on galaxy star

i have similar problem like bootloop, my galaxy star goes on restarting itself ,it lasts only a few seconds after boot and then restarts again , i have STOCK ROM which is factory installed , i did not root my phone , i didn't try any custom rom , i tried entering download mode but unfortunately download mode also doesn't last more than 3 secs phone restarts again ,what may be the problem pls help...
Nnv.18 said:
i have similar problem like bootloop, my galaxy star goes on restarting itself ,it lasts only a few seconds after boot and then restarts again , i have STOCK ROM which is factory installed , i did not root my phone , i didn't try any custom rom , i tried entering download mode but unfortunately download mode also doesn't last more than 3 secs phone restarts again ,what may be the problem pls help...
Click to expand...
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I think it is due to faulty power button.
My friends phone had similar problem. Power button was damaged and was locked,
Whenever phone booted (Samsung Galaxy y) it would restart in 3-5 seconds. Same happened in Recovery mode and Download mode.
Go to Samsung Service Center and get button repaired.

Phone restarting on its own every 5 sec

Hi ,
This morning my friends phone went derp (9300), it just keeps restarting every 5 sec , so fast i cant even manage to get into download/recovery mode .I can manage to see that "volume up to continue" yellow text in download mode, but it restarts 0.5 sec after that, same with recovery , i can see that stock android icon for 1 sec and then phone restarts.If i dont try to enter recovery/download mode phone just keeps restarting on white Glaxay s3 logo.
Note these
-Phone was never even rooted
-Battery is not problem
-Sdcard/simcard either
Has this ever happened to anyone ? If firmware is the problem is there any way to flash without download/recovery mode , or is there any way to fix it ?
Please , if you know anything that can help write it down

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I am using SpaceX Rom 5.0 for weeks and it is buggy, i experience random boot,app crash,fast battery drain and freezes.
Yesterday i reboot my phone and after "Android is Starting" i got message that System Crash or System UI i am not sure what it is but it has System word in error report. Then my phone didn't start so i remove the battery and put it again. After pressing on the Power on Button my S5 starts and i notice the Blue Light in Upper Left didn't Light Up and my phone didn't boot to 2nd Samsung Logo. When i press Power On Button my S5 will turn on and 1st Samsung Logo will appear then It will Turn Off then Vibrates then goes back to 1st Samsung Logo it keeps repeating. Also i try Recovery Mode but i can't enter to it my phone will repeat the same process as i Turn On my phone. I can go to Download Mode, And i flash Stock Rom and after flashing Stock Rom there's a blue text in upper left Recovery Booting... but its not booting into recovery, It will just turn off again then vibrates then goes to 1st Samsung Logo.
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