Samsung s9+ came with android 9. Is it possible to downgrade to android 8? - General Questions and Answers

Hello everyone, a noob here
I bought Samsung galaxy s9+ however I cannot use the sim+sd hack because of stupid message which pops up.
I read how downgrading to oreo is the solution. My phone came with pie (have not upgraded to android 10). The question is: is it possible to downgrade to oreo if a phone came with the newer software (pie, in this case)?
I had my s5 succesfully downgraded from marshmallow to lolipop however that s5 came with lolipop.
Also, how reliable is this method?:
https://forum.xda-developers.com/showpost.php?p=77001643&postcount=313
I don't want to screw a new phone up so that's why I need help from you guys Any help is welcome.
Thanks!

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Downgrade from 7.0 to 6.1.1 ? (G930 T) ?

Hi, someone can give me a tutorial to downgrade to marshmallow? I'm just getting back to android from iphone and I bought a second hand T-mobile galaxy s7 and I want to downgrade to 6.1.1
AngelxCasas said:
Hi, someone can give me a tutorial to downgrade to marshmallow? I'm just getting back to android from iphone and I bought a second hand T-mobile galaxy s7 and I want to downgrade to 6.1.1
Click to expand...
Click to collapse
hi
It should be straight forward , at least on the F and FD versions, just download the desire firmware and flash
Anyhow you have a snapdragon ( locked bootloader) , ask in the right forum, just in case
https://forum.xda-developers.com/tmobile-galaxy-s7

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