Hello friends im courently on android oreo january security patch and its running flawlessly, in a couple of days android pie shoud arive and my question is before i update what shoud i check before update so that i wont have any problems if i dont like it to get it back to oreo (i only know how to use odin would that be inaf or should i check binary code to match before update because i think that it can't downgrade from a higher binery to a smaller or something else)? Im questioning this because i found on gsm arena that a lot of users having all sort of isues after update in their countries! Thank you for your time all the best! 
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