Crucial Warning: The Snapdragon 845 platform enforces Xiaomi server authorization in Qualcomm EDL 9008 mode. If the bootloader is corrupt or the device drops to 9008, flashing through Mi Flash Tool will fail with "Unauthorized account" unless an authorized engineer account is authenticated. Maintain Fastboot accessibility at all times, and NEVER select "clean all and lock" when flashing cross-regional Global firmware on Chinese hardware (M1803D5XT/XE) to avoid triggering "This MIUI version can't be installed on this device".
Download Firmware for Xiaomi Mi MIX 2S (polaris)
polaris_global_images_V12.0.3.0.QDGMIXM_20201228.0000.00_10.0_global_e3e52bf565.tgz
Final official Global stable Fastboot release for Mi MIX 2S. Multilingual with certified Google Play Services. Flash via Mi Flash Tool with "clean all" selected.
MD5: e3e52bf5657be7795f218c4d98000d5f
polaris_images_V12.5.1.0.QDGCNXM_20210707.0000.00_10.0_cn_fccb4b63b7.tgz
Final official China mainland stable Fastboot release for Mi MIX 2S. Upgraded to MIUI 12.5 enhanced edition with optimized system framework and domestic baseband.
MD5: fccb4b63b7b1fabb0904face2761d79f
polaris_ru_global_images_V12.0.2.0.QDGRUXM_20201215.0000.00_10.0_global_20be39e4e8.tgz
Official Russian regional stable Fastboot release for Mi MIX 2S with regional cellular compliance and Russian localized services.
MD5: 20be39e4e89dfb92916c274f03d424ae
xiaomi.eu_multi_MIMix2S_V12.5.1.0.QDGCNXM_v12-10.zip
Community-optimized Xiaomi.eu multi-language stable ROM based on China MIUI 12.5. Strips Chinese bloatware, integrates Google services, and adds European multi-language support. Flash via TWRP.
MD5: 5277c39ff81d494e6ed6cb5649ec8bde
twrp-3.7.0_9-0-polaris.img
Official TeamWin Recovery Project (TWRP) touch recovery image for polaris. Incorporates proper decryption support for Android 10 File-Based Encryption (FBE). Flash via Fastboot mode.
⬇️ Download via Direct LinkTWRP-3.3.2B-0302-XIAOMI_MIX2S-CN-wzsx150.img
Popular custom recovery image by developer wzsx150 tailored for Mi MIX 2S. Includes advanced partition tools and Magisk root integration.
⬇️ Download via Direct LinkExpand preparation checklist for Xiaomi Mi MIX 2S (polaris)
- Verify your device codename is 'polaris' (in Fastboot mode run 'fastboot getvar product').
- Unlock the bootloader using the official Xiaomi Mi Unlock tool before flashing Fastboot packages.
- Install official Qualcomm USB Drivers and Mi Flash Tool (version 2018.05.28 or newer) on a 64-bit Windows PC.
- Ensure the 3400mAh battery has at least 50% charge.
- Extract the .tgz archive using 7-Zip twice until flash_all.bat and raw partition images appear in the root directory.
- Use a high-quality USB Type-C data cable connected directly to a rear motherboard USB 2.0 port.
- For TWRP recovery flashing on Android 10, use TWRP 3.7.0 to ensure File-Based Encryption (FBE) decryption support.
Compatibility & Bootloader Notes
Official Fastboot TGZ flashing requires an unlocked bootloader via the official Mi Unlock utility. Note that Snapdragon 845 Emergency Download (EDL 9008) mode requires an authorized Xiaomi service account for emergency unbricking.
Ready to Flash This Firmware?
Full step-by-step instructions for Xiaomi Mi MIX 2S (polaris), including prerequisites, error fixes, and screenshots, are on FlashGuideHub's Mi Flash Tool guide.
Can also be flashed via Fastboot: Open Fastboot Guide →
Frequently Asked Questions
While all variants share the Qualcomm Snapdragon 845 SoC, Adreno 630 GPU, and dual 12MP cameras, the China domestic versions (M1803D5XT/XE) possess domestic bootloader hardware flags, lack certain European regulatory marks, and shipped originally with China MIUI without Google Mobile Services. The Global variant (M1803D5XA) incorporates global multi-region RF filters and official Google Play certification.
Xiaomi concluded software maintenance for the Global Mi MIX 2S branch at build V12.0.3.0.QDGMIXM in late 2020. However, the domestic Chinese branch received a final major release with MIUI 12.5 (V12.5.1.0.QDGCNXM) in July 2021. Users wanting MIUI 12.5 system enhancements combined with multilingual support typically install the community-maintained Xiaomi.eu ROM (v12-10).
The Mi MIX 2S utilizes high-speed dual-lane UFS 2.1 flash memory in 64GB, 128GB, and 256GB configurations. It lacks a physical microSD expansion slot. When performing full factory clean flashes or formatting partitions, all personal data must be backed up externally via USB-C to a PC or to a USB OTG drive.
Official TWRP 3.7.0 is compiled from upstream TeamWin source code with updated decryption tables for Android 10 File-Based Encryption (FBE). The wzsx150 recovery is a specialized Chinese developer build featuring automated Magisk root injection scripts, language toggles, and customized partition management tools optimized for Chinese MIUI firmware environments.