Please if you don't know what are you doing, better avoid this straight forward process because I presume you already knows it.
Also...it will work on ALL Pie firmware versions.
Download on your SDcard all files attached here and...
Rooting process goes as follows.
1. Flash stock firmware G955FXXU4DSBA_G955FOXM4DSBA_DBT and wait for welcome screen on device and reboot in download mode again
2. Flash latest TWRP recovery
3. Enter in TWRP recovery and allow file modifications, then
3a. Format data from recovery...reboot recovery again and repeat procedure from above
4. Install from TWRP no-verity-opt-encrypt-samsung-1.0.zip from link below.
5. Reboot recovery
6. From recovery install Magisk-v18.1(18100).zip
7. Now restart and configure your device as you need.
8. Install latest Magisk app and open app, and within app, install all necessery files
9. Now you are rooted
To prepare before, please with Root explorer app rename file audio_effects.conf in audio_effects.conf.BAK, located in folder Vendor/etc
1. Install latest busybox
2. Install ViPER4Android_FX_v2505_A7.x_Nougat_IO_test_fix.apk from here
3. Reboot device and go into TWRP
3a. Install FUSION KERNEL from link below ( one of the fastest kernels I have ever seen)
4. Install Viper drivers as usuall
5. Reboot device
Viper4android is installed.
In Settings check in Sound and vibrations menu if Viper is your default sound module, if not, select it.
THANK YOU NOTE GOES TO ALL DEVELOPERS WHO BLESSED US WITH THEIR WORKS !
FUSION KERNEL with permissive mode
I do not take any responsibility for possible errors or damaged devices caused by lack of someones knowledge.