Before you flash: Flashing firmware will erase all data on your device. Back up contacts, photos, and apps before proceeding. FlashGuideHub is not responsible for any damage caused by following this guide.
About the Xiaomi Mi MIX 2S
The Xiaomi Mi MIX 2S was released in April 2018, built on the flagship Qualcomm Snapdragon 845 SDM845 (10nm LPP, 64-bit Octa-core: 4x 2.8 GHz Kryo 385 Gold + 4x 1.8 GHz Kryo 385 Silver) platform. Featuring a 5.99-inch bezel-less Full HD+ display, a ceramic back panel, dual 12 MP cameras with 4-axis OIS, and 7.5W Qi wireless charging, the handset delivered flagship performance across international markets.
Flashing official factory Fastboot firmware using Xiaomi Mi Flash Tool repairs corrupted partitions, recovers bootlooping devices, and restores official MIUI stability. Follow the verified driver preparation and procedural steps below to flash your device safely.
Which Flash Mode Should You Use?
Fastboot Mode (Bootloader Flashing)
Official flashing interface for unlocked devices. Writes raw partition blocks via Mi Flash Tool or flash_all.bat scripts.
Qualcomm HS-USB QDLoader 9008 (EDL Mode)
Emergency download mode accessed via motherboard test points. Requires Xiaomi server authorization on the Snapdragon 845 platform.
Stock Android Recovery Mode
Stock recovery interface for executing factory data wipes or clearing cache partitions.
What You Need Before Flashing
A PC running 64-bit Windows with Mi Flash Tool and official Qualcomm USB drivers installed.
Download and unpack the official V12.0.3.0.QDGMIXM archive twice with 7-Zip until flash_all.bat is visible.
Ensure the 3400mAh battery has at least 50% charge to ensure stable power delivery throughout the flashing process.
Use a quality USB Type-C data cable connected directly to a rear USB 2.0 port on the computer motherboard.
In Mi Flash Tool, select "clean all" at the bottom right. Never select "clean all and lock" on cross-region hardware.
How to Flash the Xiaomi Mi MIX 2S — Quick Overview
A fast reference for flashing the Xiaomi Mi MIX 2S (Snapdragon 845) using Mi Flash Tool. For the complete walkthrough with images and error troubleshooting, see the full guide.
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Unlock bootloader & extract Fastboot TGZ archive
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Install Qualcomm USB Drivers & Mi Flash Tool
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Boot Mi MIX 2S into Fastboot mode
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Select firmware folder & choose "clean all"
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Flash partitions and await automatic reboot
Fastboot Rawprogram XML & Firmware Package for Snapdragon 845
Official Fastboot firmware packages for the Xiaomi Mi MIX 2S (polaris) contain raw partition binaries (boot.img, system.img, vendor.img, cust.img, modem, and splash) orchestrated via rawprogram0.xml, patch0.xml, and flash_all.bat. When executed in Mi Flash Tool, these scripts write partition images directly to the Qualcomm Snapdragon 845 UFS 2.1 storage controller.
rawprogram0.xml
Official factory Fastboot firmware for the Xiaomi Mi MIX 2S utilizes rawprogram0.xml and patch0.xml executed through flash_all.bat. In Mi Flash Tool, select the root extracted folder containing these scripts.
The Mi MIX 2S (board codename polaris) features the Qualcomm Snapdragon 845 (SDM845) processor with 6GB/8GB LPDDR4X RAM, fast UFS 2.1 storage, and a 3400mAh battery supporting Qi wireless charging.
Always confirm your device codename is "polaris" before flashing. Do not flash packages from the earlier original Mi MIX (lithium) or Mi MIX 2 (chiron), as the partition maps and chip architectures are completely incompatible.
Xiaomi Mi MIX 2S Firmware Versions
Tested stock firmware package for the confirmed hardware variant of the Xiaomi Mi MIX 2S. Always confirm your model codename is "polaris" before flashing.
| Version | Region | Android Version | Size | MD5 | Download |
|---|---|---|---|---|---|
V12.0.3.0.QDGMIXM (20201228.0000.00) |
Global Stable (MI) — Multilingual | Android 10.0 (MIUI 12.0) | 2.40 GB | — | ⬇️ Download |
This device family includes 6 verified packages across Global, China, Russian regional builds, Xiaomi.eu, and TWRP recovery releases. Browse the complete 6-package archive on AndroidFirmwareFile.com →
Xiaomi Mi MIX 2S — Important Notes
Flashing official Fastboot TGZ firmware via Mi Flash Tool resolves system partition corruption, eliminates bootloops, and restores factory MIUI software stability.
Because the Snapdragon 845 architecture enforces Xiaomi server authentication on Qualcomm 9008 emergency download mode, open EDL testpoint flashing cannot be performed without authorized credentials. Ensure your bootloader remains unlocked and maintain Fastboot access as your primary workshop lifeline.
Troubleshooting Xiaomi Mi MIX 2S (polaris) Mi Flash & Fastboot Errors
Storage Encryption: TWRP Unable to Mount /data (0 MB internal storage) on Android 10
Frequently observed when attempting to flash custom ROMs or install zips on Android 10 (MIUI 12/12.5). Because Snapdragon 845 enforces File-Based Encryption (FBE), older custom recoveries cannot mount or decrypt user storage. Community repair discussions on XDA emphasize updating to TWRP 3.7.0+ or navigating to "Wipe" > "Format Data" and typing "yes" to rebuild an unencrypted ext4 data partition.
Emergency Lockout: EDL 9008 "Unauthorized account" / Sahara Handshake Rejection
When attempting testpoint unbricking in Qualcomm HS-USB QDLoader 9008 mode, Mi Flash Tool rejects the session with an authentication error. The Snapdragon 845 platform implements signed firehose programmers (prog_ufs_firehose_sdm845_ddr.elf) requiring Xiaomi EDL server credentials. Technicians advise exhausting Fastboot recovery methods (flash_all.bat) or utilizing authorized Mi service channels rather than relying on open EDL flashing.
Boot Failure: "This MIUI version can't be installed on this device" Regional Lockout
Occurs when flashing Global stable firmware (V12.0.3.0.QDGMIXM) onto Chinese domestic hardware models (M1803D5XT / M1803D5XE) while selecting "clean all and lock". The bootloader verification code detects the mismatch between the board's hardware region flag and the flashed firmware region. Workshop recovery requires returning to Fastboot and flashing with "clean all" (flash_all.bat) to keep the bootloader open.
For in-depth Xiaomi Fastboot error codes, EDL testpoint pinouts, and driver troubleshooting: Mi Flash Tool Error Directory →
Frequently Asked Questions — Xiaomi Mi MIX 2S
No. On the Snapdragon 845 platform, Xiaomi enforced cryptographic authentication on Emergency Download (EDL 9008) mode. Attempting to flash via testpoint 9008 with standard Mi Flash Tool will result in an "Unauthorized account" error. Keeping an unlocked bootloader and relying on Fastboot mode is critical for repair.
Android 10 on the Mi MIX 2S utilizes File-Based Encryption (FBE). Older custom recovery builds cannot decrypt user partitions. Community repair technicians recommend flashing TWRP 3.7.0 or higher, or executing "Wipe" > "Format Data" (typing "yes") in TWRP to wipe encryption headers prior to flashing.
This error triggers when flashing international Global firmware onto Chinese market hardware (models M1803D5XT or M1803D5XE) while selecting "clean all and lock". The bootloader detects the regional mismatch and locks into a recovery bootloop. To prevent this, always select "clean all" (flash_all.bat) to leave the bootloader unlocked.
Hold down the Power button continuously for 10 to 12 seconds until the screen goes completely dark. Immediately hold down Volume Down and Power together until the Fastboot logo appears on the display.
Ready to Flash?
Follow the full step-by-step Mi Flash Tool guide with interactive progress tracking, prerequisite checklist, and complete troubleshooting.