[Redmi 4X]What matters is which Rom you have installed. If you change from the dev to the stable and vice versa, you have to run a format data first, if you stay with the same Rom and only have a higher Version Number, you do not have to do anything. No wipe and no format (dirty flash)
I have plans of installing .eu MIUI 10.3 stable over one of the firsts MIUI 10.3 betas, but i won't format data, i don't want to lose apps/setting.
What happens if i make it?