[Galaxy Note 4 Q&A, Help & Troubleshooting] alfa_newuser:
looking for your help

Hello Guys ,

this post is a bit long as i try to explain in more detail my issue & let you be on the same page with me

Mobile : SM-N910C , running Android 6.0.1 , MMB29K.N910CXXS2DQC6 (current one & third update i flashed)

here is my story

1- I rooted my device using CF-AR method , & everything was ok

2- I installed Flashfire app & flash a custum recovery TWRP

3- new firmware available , i flash it using flashfire ; in order to avoid loosing root as per developer suggestion , but unfortunately , i lose the root access

4- i root my device for the 2nd time using super su & TWRP , every thing was ok , but i notice a long delay in booting as the device stop @ Galaxy note 4 logo for more than 1 min & then boot normally & don't know the reason

5- hint : in all steps i do my best to have the lateest version of Super SU

6- then after sometime , i notice that my device reboot by it self & sometimes , power on bottom didn't work & i pull the battery in order to switch it on . this problem happened many times & don't know why ?

7- New firmware available , i flash it using flashfire " full firmware + stock recovery " & and again i lose the root access , i use CH-AR method to gain root access again , firmware is N910CXXS2DQC6

8- after that i upgrade to latest super su from play store.

9- after that i notice the device freeze & shutdown & try to switched it on & fail , even after removing the battery , the device appear as dead one , even no charging response when i plug it in the original charger.

10- after 3 - 5 hours , it response & booted normally , but the issue on # 9 happened again with no way to switch it again , battery is full & the device is in a good hardware condition.

11- when the device start working again after one day of death , i flash N910CXXS2DQC6 again using flashfire app , root using CH-AR & update super su . " i didn't do any data wipe in previouse steps " . again freezing & shoutdown happened again & i can't switch it on again

12- the last time it stop working i try some basic troubleshooting , i try to measure the voltage on battery pinout in my device & it give me non zero reading , the mobile start responding again with this voltage is zero " i try soft restart by pressing power bottom for 1 min to release this voltage.

13- when the device start working again , i go directly to download mode & flash full firmware N910CXXS2DQC6 using odin & keep my device unrooted in order to discover what happened & ask for your help.

14- Now my device is ok , not freeze , no restart , long battery drain time " 2 days in normal usage "

Here is my questions :

1- is there any mistake in what i did above ?

2- why i lost root when i upgrade firmware using flashfire , developer confirm that it will keep the device rooted when flashing new firmware or OTA

3- Point # 4 , is it nomral for the device to take long time display galasxy note 4 logo after i root using TWRP & Super su ? this was not thae case when i roor using CF-AR method.

4- is there any issue with latest version of Super su from play store , is it match my android ?

5- is there any issue in using flashfire in flashing firmware & avoid loosing root ? , actually i lose root every time when i use it & install it manually as described

6 - what is the reason behind freeze & shutdown & stop power on as described in point 9 & later points ?

7- what is the best & safe way to root my device ?

sorry for long post & looking for your usual help

Thank you in advance