What is the difference between versions ending with A and I?

What is the difference between versions ending with A and I and which should I get?

Contributor

@yamashiro with Flyme 5 there will be changes

Hi there i would like to ask about upgrading the firmware between I and A, is there cause any problem to my device in the future if i installed flyme A vers. To replace previous I version?

Can i change it back into I version if there update of flyme in the future?
I wish someone would help me answer this :)

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