S8 G950F july OTA update AQG7 - Samsung Galaxy S8 Questions and Answers

Australian S8 G950F firmware G950FXXU1AQG7
This firmware is an OTA from July. I want to gain root access so followed the majority of advice from within the forums. So first step install twrp.
I attempted to install twrp 3.1.1-1 that is used for firmware AQF7
Then i tried twrp 3.1.1-2 being used for firmware AQG5
Both of these attempts failed and gratful i did not do any harm to the device i have stopped their and now seek advice about methods and tools known to work on this particular firmware. Please any help truly appreciated and thankyou in advance for your time and knowledge

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1. so is there any way to retain root while updating firmware with flashfire or odin
And
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Sorry if this question has been asked before. And i know we should not post any repeated question. But trust me i read all threads before posting here.but i cant find any solution for it.
Thanking you for your kind cooperation and support.
Device:
S7 edge SM-G935FD INDIAN
Plz help guys

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