Help! My Samsung S8+ is stuck on the Samsung Galaxy s8+ Powered by android screen! - Samsung Galaxy S8 Questions and Answers

I have a Samsung Galaxy S8+. It is now stuck on a boot loop. It all started when it crashed and turned off when I was watching something on Youtube.
I already tried using Odin and flashed my phone. It worked for like a week and then the problem repeated itself when there was a software update. It was updated. Then after a day the boot loop started again.
I flashed my phone again but it wont work anymore.
I will always get these types of messages:
dmverity hash failed
or
cannot open recovery cause
or
invalid
please help :crying::crying::crying:

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So a friend of mine owns a Note 4 N910H, and yesterday it froze while attempting to post online, so he forced it to turn off. It now refuses to boot, and keeps getting stuck on the Note 4 logo. Ive tried using recovery mode, and thats not working. The Samsung store at the mall told him that they weren't able to connect to their computer to reflash the software either. Any possible solutions?
My device is not passing the Note 4 logo neiter. I can enter bootloader and flash anything, but afterwards it is looping again... is it vibrating two times before restart?

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Note 4 Stuck in initial boot screen. Tried everything I could.

My Galaxy note 4 is stuck in that "Powered by Android" screen when booting.
Model Number is SM-N910C.
Download Mode is the only mode accessible. Recovery mode is not available now.
It worked just fine running Sweet ROM just a few days ago but randomly stopped working.
After trying multiple re flashes of TWRP, I eventually resorted to just restoring a system firmware image from SamMobile.
I have the exact same results as before, but now the recovery button combo does not result in any error. The phone tries to boot up normally and is stuck as mentioned before.
Plugging it in charging causes the phone to boot up and then get stuck in that screen again. This is incredibly frustrating.
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S7 Edge Freezing / Restarting even in TWRP

Hello, guys!
I'm coming here with a big problem. I used to have a Galaxy S7 Edge (Exynos edition) , but decided to buy a new phone.
I haven't use S7 Edge for 6 months, after this time the phone isn't working anymore. Used to work very well before that.
I've managed to charge it.
First symptom: keeps restarting and freezing when passing from Galaxy LOGO.
What I have tried until now:
1. Flashed TWRP 3.4.x.x
2. Flashed Floyd ROM, worked for 10-15mins but started again to enter an infinite loop of RESTARTING and sometimes freezing.
3. Flased a boot.img extracted from a UnitedKingdom SW. The flashing process was done by using adb while the phone was on TWRP.
4. Flashed Samsung Original SW using ODIN. The flashing process succeded but the phone kept showning "no command" message alongisede with a nice and green Android )
Can you help me revive this phone?

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