[Q] downgrade/upgrade without root with official firmware

Hi! here is the situation, i would like to know if it is possible to upgrade/downgrade an android phone (samsung mostly) with official firmwares without the need to root? The reason is that some testing is needed on these devices and only with official firmwares it would be valid. And at will it would be nice to be able to switch versions for different test purposes.

Thanks in advance!

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