How to flash Official ROM on SAMSUNG GALAXY S6 EDGE I was offered a Samsung Galaxy S6 Edge a few months ago and I discovered over time that applications installed themselves on my phone and performed operations in the background and my ins such as activate the microphone , play music or send sms. I tried several factory values ​​reset but nothing changes, each time I have the internet connection activated they reinstall completely. This has the effect of heating my phone and reducing the life of the battery.

So I decided to flash my phone with an Official ROM that I did on SamMobile But when I launched the flash with Odin and my phone in download mode the operation failed!

I haven't been able to solve this problem for months already that's why I come here to ask for your help.

when the flash fails, my phone displays the error "SECURE CHECK FAIL: (BOOTLOADER)

I would like to make some clarifications:
- my phone is an SM-G925F (This is what is written behind it is also what is displayed in the settings)
- In download mode I rather see Product: name SM-G925L
- in the developer option, I don't find the "Unlock OEM" button
- When I click on "Software update" in my phone, nothing happens
- I don't know if it's important to specify it but I live in Cameroon

I need help please!
It looks like you Galaxy S6 Edge may have been rooted as I see current binary and system status are indicated as custom and that would explain not being able to OTA update.  I also know that some unlocked refurbished phone replace motherboards as long as the hardware fits.  Its my understanding that what is displayed in the download mode, i,n this case "G925L", will be the correct variant when choosing the proper firmware.
  I've rooted every Samsung I have ever owned and have never had the issues you described prior to factory reset.  It is my humble option that your phone may have been compromise  and suggest your change all your password accounts.  It would be easier is you did this after a successful boot rather than before as you'll face Google FRP lock.   Good luck