Samsung SM-J415F BOOTLOOP Can't Acces Downloading Mode and Recovery.Always Reebooting - Android Q&A, Help & Troubleshooting

I have a Samsung J4 Plus 2018 SM-J415F device. Previously I used Magisk for my Rooting Samsung ... after my SmonePone felt slow then I uninstalled Magisk and hoped it could eliminate Root access. After that I got a problem that was stopping at the Samsung logo, when it was still able downloading mode. Then I installed the Samsung SM-J415F Firmware in accordance with my smartphone model in Samsmobile. After installing the Firmware I got a newer problem namely Use Emergency Recovery Function blah blah "+ Reeboting every 5 seconds ... the problem is there I can't access Downloading Mode because it's always Reebot every 5 seconds. I tried going to the Samsung Service Center, and he said "You have to replace the mainboard to be able to turn on your Smartphone" what does that mean? Do I have to replace the Mainboard?The Price of Maiboard very expensive..
I don't know what to do ... is there a solution to solve this problem? Please
help me.. i Can't insert the Video About Error my phone I dont Know Why Xda Develepors Thank you
crying::crying::crying::crying::crying::crying::crying::crying:

I also have same problem SM-J415F. Someone please help us.

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[Q] Samsung devices stuck in bootloop help?!?

samsung s3 att -4.1.1
Galaxy note 10.1 -4.1.2
Im a user of these 2 devices and not a developer maybe in the future i will (maybe), but still i recently updated a good app and now both rebooted at the exact same time and now booth stuck in a boot loop.
(reported the app)
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ALL STOCK LEGIT UPDATES
I can access the odin screen and the recovery screen.
I need these devices back i use them as my computer and phone.
Some issues-
They wont show up on my computer when connected
kies has never worked on my computer right so thats out.
Ideas would be great and i know this isnt meant ofr this forum really since its more developer problems but i figure those who root and abuse the devices can fix them some how.
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Samsung Xcover problem

Good morning
I have a serious problem my phone which is a Samsung Xcover 2 Model GT-S7701L cannot boot after I tried to root it.I can however access the download mode but not recovery.I have tried multiple things such as this:
http://forum.xda-developers.com/showthread.php?t=2204889&page=6
Look the first post by Veimus
I have the exact model and now when it boots there is a static screen then the logo for some weird reason a Samsung Galaxy home screen that then fades into glitched imagery.The device is still recognized by Odin thank god and it can still charge so it is recognize by the computer.So it is not a complete hard brick where the phone is dead.Earlier my phone had the boot loop glitch after I tried rooting it from the instructions in this thread:
http://forum.xda-developers.com/showpost.php?p=40232503&postcount=45
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[Q] Samsung Galaxy Ace 2 Phone Rooting

Hello everyone
I am very new to this website as I just signed up and registered today. I am currently having a problem with my android phone, and I cant figure out how to resolve it.
The problem that I am having is that last week I was updating my phone when something in the device and caused my phone to become bricked. And after spending many hours on Youtube I finally found a video that helped me recover my phone by flashing the phones memory with clockworks recovery using odin and I was able to get my phone back up and working. But now whenever I turn my phone on I see the yellow triangle appear on bootup and I want to get rid of the triangle.
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Model Name GT-S7560M
Any help would be appreciated.
Thanks

Help, I think I soft-bricked my device and can't do an emergency recovery!

I tried to unroot my device but it got stuck in a bootloop, so I did some research and decided to restore it with smartswitch, it failed (I have no idea why) at around 70 percent.
The device is now showing me "An error occurred while updating the device software. Use the emergency recovery function in the smart switch pc software,
I tried to do a ton of times, I tried both the the emrgency recovery and the other option (I don't remember how it's called) and they won't work! The files are downloaded but then when the process starts it always gets stuck at 0 percent! I also tried to install the drivers, nothing
I alaso tried to flash a stock rom (no brand but I'm using TIM) and it immediately failed.
The device is a samsung s6 SM-G920F, it had 6.0.1 and m brand is TIM. Odin version is 3.12.3. I'm dowloading another stock firmware with my brand and 6.0.1, hopefully, does someone know why everything is not working?
Please help I'm going crazy
You may have to send your device back to your manufacture to get it fixed
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