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Hello i got an iphone 5s which reboots constantly , when i checked the battery i saw that it was drained i thought that the problem is from the battery , so i changed it then i tried to start the iphone and it is still rebooting constantly i tried to restart the iphone by pushing the power and home button , still reboots constantly i also tried to restart by pushing power button and volume up , but it still reboots constantly Then , i tried to get it on recovery mode to restore from itunes, but i couldn’t , it still reboots , but here there was a red screen that shows for 1 sec at the end when it decide to reboot again , this red screen only happened here not the previous cases i think the problem is software , can’t get it on itunes mode do you agree that it’s software problem ? and can you help me please get it on itunes mode ? thank you

There are a few failures in the device that can cause this.

  1. Battery: I know you said you replaced the battery, however, there is a chance the battery you received has gone bad. 2)Powe button short: A short circuit on the power button, may be causing it to think that it is continually being held down. Replace this component to fix that issue
  2. Software: The software may have become corrupt. Put the device into DFU mode, and reload the software. -a) Unplug the battery. -b) Plug the device in to the PC, and replug in the battery after -c) Press/Hold power button until Apple Logo arrives. -d) Continue holding the power button, and hold the Home button until apple logo disappears -e) Let go of the power button, but keep holding the home button until compute begins installing drivers -f) follow instructions on iTunes to reload software
  3. Modular Short: A short circuit on a modular component may be causing confusion in the voltage levels of the devices. Try removing everything besides the required components for boot, (Screen, Power button, and battery) If that doesnt fix it, swap the power button, with charge port, and try booting it by plugging in the device.
  4. Motherboard: The mainboard is your last possible failure. Check for any physical damage under a microscope (Suggested 10X). if none is found you likely have an internal failure of an IC, and it would be more likely that replacing the device is your last option.