This is about flashing only. I don’t know if the device will accept the firmware because of a potential carrier lock (in whatever way that is implemented).
If you’re on linux, you can use odin4. For me, this tool worked best overall. (Note that it’s 100% proprietary and you basically need to run a random file from the internet with special privileges.)
You can run odin4 -h to see the cli options. You should have 5 *.tar.md5 files for a newer phone.

• AP_…tar.md5 - use this file with the -a argument
• BL_…tar.md5 - use this file with the -b argument
• CP_…tar.md5 - use this file with the -c argument
• CSC_…tar.md5 - use this file with the -s argument ONLY if you want to reset your whole device (I’m not sure if this will force a reset every time on all devices, but it did a reset for me)
• HOME_CSC_…tar.md5 - use this file with the -s argument if you just want to do an update to your system (of course there’s no guarantee that it won’t reset, so make sure you have backups)

So you should something like this with root privileges:

odin4 -a AP... -b BL -c CP... -s CSC...

I think for carrier lock removal, you need to reset your phone anyway, so you can use the CSC file.

I hope this helps!

I have found this app. Didn’t test it but you might try it. https://github.com/maforn/TimedShutdownAndroid

On a rooted device or with adb you can execute the command:

sleep 60m && reboot -p