Q1. Which HyperOS build is best for a stock Xiaomi 13 Ultra?

For stock users, the best balance of stability and features comes from the newest official ROM that matches the device’s original region, such as OS2.0.208.0.VMAMIXM for Global, OS2.0.204.0.VMAEUXM for EEA, OS2.0.204.0.VMARUXM for Russia, OS2.0.204.0.VMATWXM for Taiwan, or OS3.0.3.0.WMACNXM for China according to official firmware trackers.

Q2. Does HyperOS 3 (OS3.0.3.0.WMACNXM) improve camera speed and UI lag on Xiaomi 13 Ultra?

Changelogs for OS3.0.3.0 emphasize smoother performance, improved memory allocation, and better frequency scheduling, which directly target lag and stutter seen by many HyperOS users, especially in heavy camera and multitasking scenarios.

Q3. Can a clean fastboot flash fix overheating and rapid battery drain after a HyperOS OTA?

Many users facing heat and drain after OTA updates report improvements after a full fastboot flash, because it removes leftover cache and inconsistent system files, allowing updated power management and scheduler tweaks to work as intended.

Q4. When should xiaomi.eu_ISHTAR_OS3.0.3.0.WMACNXM_16.zip be used instead of an official ROM?

This custom ROM is best suited to advanced users with an unlocked bootloader who want HyperOS 3 based on the China build but with multi‑language, integrated Google services, and less bloat; typical users who rely on full official support should stay with their matching stock region ROM.

Q5. How does the TWRP image help with Xiaomi 13 Ultra firmware management?

The TWRP image for ishtar enables full NAND backups, easier flashing of ZIP‑based ROMs like xiaomi.eu, and more granular control over caches and modules, which is useful when optimizing or recovering a heavily customized system, though it is not mandatory for fastboot ROM installs.

Q6. Is downgrading from HyperOS 3 back to HyperOS 2 safe on Xiaomi 13 Ultra?

Downgrading across major branches is risky due to anti‑rollback; it is essential to verify ARB levels and follow device‑specific downgrade guidance, as flashing an older, incompatible build can lead to irreversible brick or require specialized repair tools.

Q7. Why does Xiaomi 13 Ultra feel slower after a HyperOS update even with high‑end hardware?

Reports across HyperOS devices describe heavier animations, stricter background limits, and sometimes mis‑tuned thermal policies, which can make even fast SoCs feel sluggish; new firmware like OS3.0.3.0 aims to rebalance these factors and better exploit Snapdragon 8 Gen 2’s performance headroom.

Xiaomi 13 Ultra (ishtar) HyperOS 3 & 2 ROMs + TWRP Download

Xiaomi 13 Ultra (codename ishtar) is a flagship camera‑centric phone, but HyperOS users frequently report battery drain, heat, and camera/UI lag after major updates. Clean flashing the correct fastboot ROM for each region, or moving to a tuned xiaomi.eu build, often stabilizes performance, fixes throttling, and improves day‑to‑day responsiveness while keeping the powerful Leica camera stack usable at its full potential.

Download Firmware for Xiaomi 13 Ultra (ishtar)

Below are official HyperOS fastboot ROMs and a custom xiaomi.eu build for Xiaomi 13 Ultra, listed from newest to oldest, plus a matching TWRP image. China WMACNXM is already on HyperOS 3 / Android 16, while most global regions remain on HyperOS 2 / Android 15; always match the original region (CNXM/MIXM/EUXM/RUXM/TWXM) shown by trusted firmware trackers and in system info. Custom xiaomi.eu ROMs target experienced users who want debloated, multi‑language firmware based on the latest China build.

Filename	Region / Variant	Build Number	Build Date	Android Version	Flashing Method	Notes	File Size	Download
ishtar_images_OS3.0.3.0.WMACNXM_20251202.0000.00_16.0_cn_3614ef8aba.tgz	China (CNXM)	OS3.0.3.0.WMACNXM	2025-12-02	Android 16 / HyperOS 3	Xiaomi Flash Tool (Fastboot)	Latest China HyperOS 3 fastboot ROM; changelog highlights smoother UI, refined scheduling, better memory reclaim, and lower power use, targeting lag and heat complaints. Best choice for stock China devices staying on official firmware.	8.70 GB	Download From Xiaomi (CN)
ishtar_global_images_OS2.0.208.0.VMAMIXM_20251024.0000.00_15.0_global_2081c9f3c3.tgz	Global (MIXM)	OS2.0.208.0.VMAMIXM	2025-10-24	Android 15 / HyperOS 2	Xiaomi Flash Tool (Fastboot)	Latest official global HyperOS 2 fastboot ROM; balances stability and features and addresses many performance regressions from early HyperOS on Snapdragon 8 Gen 2. Recommended for non‑China 13 Ultra units originally sold as global.	7.65 GB	Download From Xiaomi (Global)
ishtar_eea_global_images_OS2.0.204.0.VMAEUXM_20251027.0000.00_15.0_eea_29282e8c66.tgz	Europe EEA (EUXM)	OS2.0.204.0.VMAEUXM	2025-10-27	Android 15 / HyperOS 2	Xiaomi Flash Tool (Fastboot)	EEA ROM for EU market with GDPR‑aligned services and EU‑specific customizations; ideal to keep full OTA chain and regional compliance on European devices. Slightly older than MIXM numerically, but tuned for EEA carriers.	7.53 GB	Download From Xiaomi (EEA)
ishtar_ru_global_images_OS2.0.204.0.VMARUXM_20251203.0000.00_15.0_ru_6dbbf2b6a8.tgz	Russia (RUXM)	OS2.0.204.0.VMARUXM	2025-12-03	Android 15 / HyperOS 2	Xiaomi Flash Tool (Fastboot)	Region‑specific RU build; includes Russian‑focused services and regulatory adjustments. Suitable only if the original CSC is RUXM for better network and service compatibility.	7.59 GB	Download From Xiaomi (RU)
ishtar_tw_global_images_OS2.0.204.0.VMATWXM_20251203.0000.00_15.0_tw_af283e79a9.tgz	Taiwan (TWXM)	OS2.0.204.0.VMATWXM	2025-12-03	Android 15 / HyperOS 2	Xiaomi Flash Tool (Fastboot)	Taiwan firmware tuned for local carriers and services; safest for TW‑sold 13 Ultra units to keep VoLTE/VoWiFi and OTA behavior consistent. Slightly smaller package but feature‑complete for the region.	7.00 GB	Download From Xiaomi (TW)
xiaomi.eu_ISHTAR_OS3.0.3.0.WMACNXM_16.zip	xiaomi.eu custom ROM (multi‑region)	OS3.0.3.0.WMACNXM (based)	Matches CN OS3.0.3.0	Android 16 / HyperOS 3 (modded)	Custom: TWRP / Recovery flash	Community‑tuned ROM built from China OS3.0.3.0 with multi‑language, integrated Google services, and some debloating; generally smoother and less aggressive RAM management than pure CN while preserving camera features. Intended for experienced users with unlocked bootloader.	6.66 GB	Download From SourceForge (xiaomi.eu)
twrp-3.7.1_12-v9.0_A15-ishtar-skkk.img	Custom Recovery (TWRP)	3.7.1_12-v9.0_A15	2024-12-14	Android 12+ compatible	Fastboot flash recovery / boot	Unofficial TWRP image for ishtar; used for flashing xiaomi.eu ZIPs, making full backups, and managing modules. Should be used only after reading device‑specific TWRP instructions; not needed for pure fastboot ROMs.	≈100 MB	Download TWRP For ishtar

Choosing the right file: For stock users, the recommended path is the newest official fastboot ROM that exactly matches the phone’s original region code (WMACNXM for China, VMAMIXM for Global, VMAEUXM for EEA, VMARUXM for Russia, VMATWXM for Taiwan) as reflected in trusted ROM databases and the device’s original CSC. xiaomi.eu_ISHTAR_OS3.0.3.0 is better suited to enthusiasts who already run custom recovery and want HyperOS 3 with Google apps and optimizations. Older HyperOS 2 builds should only be used for targeted downgrades once anti‑rollback has been checked.

Complete Device & Firmware Overview

Device Name:: Xiaomi 13 Ultra
Codename:: ishtar
Model Numbers:: 2304FPN6DC (China), 2304FPN6DG (Global/EEA and others)
Chipset:: Qualcomm Snapdragon 8 Gen 2, flagship SoC with strong sustained performance when thermals are tuned correctly.
Display & Camera Highlights:: LTPO AMOLED, up to 120 Hz; Leica‑branded multi‑sensor camera system; performance heavily tied to camera and ISP optimizations that HyperOS updates refine.
Firmware Families:: HyperOS 2 (Android 15) for Global/EEA/RU/TW; HyperOS 3 (Android 16) for China and derived custom ROMs.
Latest China ROM:: OS3.0.3.0.WMACNXM fastboot (Android 16, HyperOS 3).
Latest Global ROMs:: OS2.0.208.0.VMAMIXM (Global), OS2.0.204.0.VMAEUXM (EEA), OS2.0.204.0.VMARUXM (RU), OS2.0.204.0.VMATWXM (TW).
Security Patch Level:: Late‑2025 security patches, with OS3.0.3.0 and OS2.0.208.0 branches shipping current monthly patches depending on region.
Firmware Types:: Fastboot ROMs (ishtar*_images_*.tgz) for Mi Flash on Windows, and custom xiaomi.eu ZIPs for recovery/TWRP.
Bootloader & ARB Rules:: Bootloader unlock generally required for cross‑region flashing and all custom ROMs; anti‑rollback (ARB) means downgrades must be checked to avoid hard bricks.
Recovery Option:: TWRP image twrp-3.7.1_12-v9.0_A15-ishtar-skkk.img is used for advanced tasks like flashing xiaomi.eu, full backups, and module management.
Common Issues These ROMs Target:: HyperOS user reports mention post‑update battery drain, extra heat, sluggish animations, and camera app lag; changelogs for OS3.0.3.0 emphasize smoother performance, memory optimizations, and lower power use to address this.
Required Tools:: Xiaomi USB and fastboot drivers, Xiaomi Flash Tool for fastboot ROMs, and optionally TWRP for custom ZIPs, plus a quality USB‑C cable and Windows PC.

CRUCIAL WARNING: These fastboot and custom ROMs are strictly for Xiaomi 13 Ultra with codename ishtar; they must not be flashed to other Xiaomi or Redmi devices with different codenames, as cross‑flashing can permanently brick the device through incompatible partition layouts and firmware.

All official ishtar*_images_*.tgz fastboot packages typically wipe user data when used with Xiaomi’s fastboot tools, and choosing “clean all and lock” with a mismatched region can relock the bootloader on an unsupported ROM and cause bootloops, network loss, or ARB‑related brick scenarios.

Preparation Before Flashing

Click here for the Xiaomi 13 Ultra (ishtar) pre‑flash checklist

Confirm codename and region: In fastboot mode, verify that the device reports codename ishtar and that the intended ROM region (CNXM/MIXM/EUXM/RUXM/TWXM) matches the original CSC as documented by trusted ROM databases.
Backup all important data: Fastboot flashes and many custom ROM installs will fully wipe data; create backups with Mi Cloud, Google account sync, and manual copies of photos and documents to a PC or external drive.
Charge the battery: Keep at least 60% charge to reduce the risk of power loss during flashing, which could corrupt partitions and require service‑level recovery.
Install required drivers and tools: Set up Xiaomi USB/ADB drivers, fastboot drivers, and Xiaomi Flash Tool on the PC for fastboot ROMs; download TWRP and ADB/Fastboot tools if planning to flash the xiaomi.eu ZIP.
Use a reliable USB‑C cable and port: Prefer the original cable and a direct rear motherboard USB port to minimize disconnection risk while flashing high‑size images, especially for the large HyperOS 3 builds.

Quick Firmware Flash Instructions

This simplified guide covers flashing any of the listed fastboot ROMs, such as ishtar_images_OS3.0.3.0.WMACNXM_... for China or ishtar_global_images_OS2.0.208.0.VMAMIXM_... for Global, using Xiaomi’s fastboot flashing tool on Windows.

Prepare PC and ROM: Install Xiaomi USB/fastboot drivers and Xiaomi Flash Tool, then download and fully extract the chosen ishtar*_images_*.tgz (for most stock global users, the recommended option is ishtar_global_images_OS2.0.208.0.VMAMIXM...) into a short folder path like C:\ishtar_rom.
Boot Xiaomi 13 Ultra into fastboot: Power off the phone, hold Volume Down + Power until the fastboot screen appears, and connect it to the PC with a stable USB‑C cable.
Configure Xiaomi Flash Tool: Launch the tool, click “select” or equivalent to point to the extracted ROM folder, and choose the “clean all” option to perform a fresh install while keeping the bootloader unlocked (avoid “clean all and lock” unless the ROM region matches exactly).
Start the flash: Click “refresh” to confirm the device is recognized, then press “flash” and wait for the tool to complete; do not disconnect the cable or close the application during the flashing process, even if it seems to pause.
First boot and optimization: After the flash finishes, the device will reboot into HyperOS; the first startup may take several minutes while the system optimizes apps and applies performance profiles, after which responsiveness and thermals should improve compared to problematic OTA builds.

For an in‑depth, screenshot‑driven walkthrough of Xiaomi fastboot firmware flashing and interpreting common Mi Flash error codes—refer to the dedicated Xiaomi Fastboot Firmware Guide, which explains the Xiaomi Flash Tool process step by step and can be applied directly when flashing these ishtar ROMs.

Frequently Asked Questions (FAQs)

Q1. Which HyperOS build is best for a stock Xiaomi 13 Ultra?: For stock users, the best balance of stability and features comes from the newest official ROM that matches the device’s original region, such as OS2.0.208.0.VMAMIXM for Global, OS2.0.204.0.VMAEUXM for EEA, OS2.0.204.0.VMARUXM for Russia, OS2.0.204.0.VMATWXM for Taiwan, or OS3.0.3.0.WMACNXM for China according to official firmware trackers.
Q2. Does HyperOS 3 (OS3.0.3.0.WMACNXM) improve camera speed and UI lag on Xiaomi 13 Ultra?: Changelogs for OS3.0.3.0 emphasize smoother performance, improved memory allocation, and better frequency scheduling, which directly target lag and stutter seen by many HyperOS users, especially in heavy camera and multitasking scenarios.
Q3. Can a clean fastboot flash fix overheating and rapid battery drain after a HyperOS OTA?: Many users facing heat and drain after OTA updates report improvements after a full fastboot flash, because it removes leftover cache and inconsistent system files, allowing updated power management and scheduler tweaks to work as intended.
Q4. When should xiaomi.eu_ISHTAR_OS3.0.3.0.WMACNXM_16.zip be used instead of an official ROM?: This custom ROM is best suited to advanced users with an unlocked bootloader who want HyperOS 3 based on the China build but with multi‑language, integrated Google services, and less bloat; typical users who rely on full official support should stay with their matching stock region ROM.
Q5. How does the TWRP image help with Xiaomi 13 Ultra firmware management?: The TWRP image for ishtar enables full NAND backups, easier flashing of ZIP‑based ROMs like xiaomi.eu, and more granular control over caches and modules, which is useful when optimizing or recovering a heavily customized system, though it is not mandatory for fastboot ROM installs.
Q6. Is downgrading from HyperOS 3 back to HyperOS 2 safe on Xiaomi 13 Ultra?: Downgrading across major branches is risky due to anti‑rollback; it is essential to verify ARB levels and follow device‑specific downgrade guidance, as flashing an older, incompatible build can lead to irreversible brick or require specialized repair tools.
Q7. Why does Xiaomi 13 Ultra feel slower after a HyperOS update even with high‑end hardware?: Reports across HyperOS devices describe heavier animations, stricter background limits, and sometimes mis‑tuned thermal policies, which can make even fast SoCs feel sluggish; new firmware like OS3.0.3.0 aims to rebalance these factors and better exploit Snapdragon 8 Gen 2’s performance headroom.