While specific "v21" versions may refer to the latest update or a particular toolset year, the primary software for these tasks is often XiaoMiTool V2 Mi Flash Tool XiaoMiTool V2 XiaoMiTool V2 : An automated tool for easy installation of ROMs and TWRP. Official Download XiaoMiTool Official Mi Flash Tool
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: Supports flashing OTA images and full ROM packages for both Qualcomm and MediaTek-based Xiaomi devices. ht mi tool 21 setup link
