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Hello is it possible to return to a lower rom that is still under android 9? ex: i m in MIUI 10.2 8.11.29 / 30 ,, then I come back to MIUI 10.2 8.11.15 ?? I'm with mi 8, I do not want to block my phone because of the RollBack protection sorry for my bad english,, i m better in french :-)