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Can we flash custom roms for Galaxy S8+ (955F) to (955FD) models?

HI!
I am in Hong Kong and the Galaxy S8 Plus (G955FD) is more easily available then the (G955F) model.
So I am wondering if the roms made for G955F can be installed to G955FD without any issues or do I have to flash something separate in addition to the rom?
Sorry if this question has been asked and asnwered before. Just want to get an answer quickly as the shop has limited stock on G955FD and I want to buy it today if possible.
Thanks.

A 1 minute search brought this up.....
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Sent from my SM-G955U1 using XDA-Developers Legacy app

Little help please

My phone is beginning to lag some so I'd like to root and use a custom Rom. It's been a bit since I had a phone I could do it to so I don't want to screw this one up. I've read a bunch of threads but there's too much to go thru. Here's what I'm running, what would be the best/easiest way to get this accomplished. Thanks
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Sent from my SM-G955U using XDA-Developers Legacy app

There are no custom roms for the Snapdragon variants yet that I know of. The bootloader hasn't been unlocked so no custom recovers either.
I'd read up on the downsides of rooting this phone too (only charging to 80%, knox tripped, etc)

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the phone has a custom 6.1 android version, and I thought flashing an older version to get rid of the potential threat of having this one, and to run smoothly. A quick search tells me to go jellybean.
Should I flash another rom in this device? Can you recommend any? Thank you!

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Please understand wrong English
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Do you already have an e sim on your device? Or already scanned that Q-Code on another phone and are trying to transfer it to another device?

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Pleae help me how to solve this issue

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