Redmi Note 4X can be manually updated to the MIUI 9 global beta version in two ways either by flashing the recovery ROM or with the fastboot ROM. I had also written an article to update Redmi Note 4 & Mi6 to MIUI 9 global beta ROM (7.8.10) a few days back. This firmware runs on Android Nougat 7.1.2 version and in case if you want to experience Nougat features on your Note 4, it’s worth trying this global beta ROM. MIUI 9 based global beta ROM (7.8.24) is released for Redmi Note 4X, codenamed as Santoni.