Abhi2503
Active Level 5
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Galaxy A
Can i downgrade my galaxy a7 2018 from android 9 pie to android oreo. Can anyone please help me out 
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SH31H
Active Level 4
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Galaxy A
yea that would help..but at the same time it would void his phone's warranty and he won't be able to use security features. The feature's like samsung pay(mini), secure folder and knox support will no longer work..

so flashing custom roms are great but should be done with the knowledge of the consequences governing them.

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Angygz
Active Level 7
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Galaxy A
I did try once but I don't know what's wrong with the firmwares rom
none of them supported. you will get an error.
Vicky455
Expert Level 2
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Galaxy A

New bootloader version restricts you from downgrading.