[Android Q&A, Help & Troubleshooting] griha41:
Hello mate. I have the SM-A115F. Here's my guide how to get ROOT with Magisk!!!!!!!!!!

I'm aware you that you will loose all your data on your phone because you need to unlock bootloader.

If you're assept with that prepare for root :)

BE CARE FULL I'M RUSSIAN AND WORK WITH RUSSIAN VERSION OF FIRMWARE, SOME STRINGS MAY BE DIFFERENT. I TRY MY BEST TO TRANSLATE 'EM CORRECTLY, BUT NEVERTHELESS!!!!!!

You must do it with follow steps:

a) Preparig^

You need to get this software:

1. ADB and Fastboot.

2. Odin.

3. Fresh firmware (I'd used SamFirm, also it's required to install Visual C++ Redist: 2008, 2012, 2015 (x86 & x64))

4. Magisk Manager (APK)

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First steps:

a) Make phone backup!

b) Remove all google accounts!!!!!!!!!

c) Enable Developer Settings menu: Settings -> About phone -> Build Number (click over that menu 8 times and enter your password)

d) Navigate to Developer Settings -> Enable OEM Unlock and also Enable ADB (Enable Debuging)

e) TURN OFF YOUR PHONE and then wait for 5 - 8 seconds.

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Unlocking Bootloader:

a) Plug your ORIGINAL USB THAT COMES WITH BOX OF YOUR PHONE to PC and NOT TO PHONE.

b) When you'll be ready: Press and hold Volume + and Volume - buttons AND PLUG USB (still hold volumes butttons).

c) after 2 or 3 seconds you'll see a blue screen where 1st position log press Volume + for unlocking -> Make it so!

d) you had long press Volume +, now system ask a comfirmation Perss Power Button.

e) When you've done you'll get clean and not vergin android phone with unlocked bootloader!

f) Make a first setup of your phone. When you've done repeat unlocking of Developer Settings and check slider of OEM Unlock IT MUST BE GRAY if so you really had unlocked your phone. If not you're failed!

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Get Root:

Required:

1. Odin

2. SamFirm and Visual C++ Redist: 2008, 2012, 2015 (x86 & x64)

3. ADB

4. 7-ZIp Archive manager

a) Start SamFirm. settings up application by typing: Model: "SM-A115F" and regian (in my case "SER" = Russia, all data not required a double quotes AND checkout that checkbox "Auto" is selected)

b) After presetin' begin of downloadin' and decrypting of fiemware (you'll get a archive)

c) In firmware archive we must find file with prefix "AP_".

d) Open it with 7-Zip

e) We must extract from there a file "boot.img.lz4"

f) Now We must pack that file into .tar archive. As result we'll get "boot.img.lz4.tar"

g) Install on your phone Magisk Manager and enable WiFi!!!!!!

h) Drop into Phone Memory -> Download folder your "boot.img.lz4.tar"

i) Open Magisk Manager -> Install Magisk -> Patch your kernel manualy -> navigate to your "boot.img.lz4.tar" file and select it!

j) Whne you've done, open on your PC your Phone -> Download folder and get from there archive: "Magisk_Patched.tar"

k) UNplug from PC your pfone and turn it off!

l) Run Odin AND IN OPTIONS TAB UNSELECT CHECKBOX "Auto Reboot"

m) Flash your file "Magisk_Patched.tar" as AP File in Odin 9For that you must turn off your prone, wait for 6 seconds, then press Volume + and Volume - buttons and at the same time plug USB from your PC. Whn you'll see blue screen, make a click over Volume + button and your in Downloading Mode!

n) Flash with Odin. If you have PASS status then you've done and press and hold for 8 seconds Volume - and POWER buttons. if you have bootloop or ERR! the you failed!!!!!

o) Now you must get in Recovery mode: Power and Volume + and in recovery make: Factory reset + Clear Cash partition.

p) When you've done Just install again your Magisk Manager and it may ask you an adition install ACCEP THAT and after reboot you'll get a rooted phone,

BUT YOU CAN'T REMOVE OR MAKE ANY CHANGES WITH /system partiton, beacuse / is mounted as READ-ONLY!