Xiaomi 12S Ultra thor
Official Xiaomi 12S Ultra stock firmware — flash file, stock ROM & IMEI repair file, free direct download.
⇄ Compare with another deviceThe Xiaomi 12S Ultra (model code thor) has 98 official stock firmware files (flash file / stock ROM) available for free download on ROM Palace — the latest released in Jan 2026. The device runs on the Qualcomm Snapdragon 8+ Gen 1 (4 nm) and its firmware covers Android 15. Each download is a direct, resume-supported link used to unbrick the phone, fix a bootloop, remove FRP, repair a corrupt or null IMEI, downgrade, or restore the Xiaomi 12S Ultra to its original factory software.
Specifications
Xiaomi 12S Ultra stock firmware & flash files (98)
Where to buy the Xiaomi 12S Ultra
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Frequently asked questions
How do I flash the Xiaomi 12S Ultra stock firmware?
Download the stock ROM / flash file for your exact Xiaomi 12S Ultra (thor), extract the archive, then flash it with SP Flash Tool (SPFT) for MediaTek (MTK) devices, or the SPD Upgrade / ResearchDownload tool for Unisoc/Spreadtrum (SPD) chipsets. Back up your data first and charge the battery above 50%. See our step-by-step flashing guide for details.
Is it safe to flash Xiaomi 12S Ultra firmware?
Flashing official stock firmware is safe as long as you use the correct stock ROM / flash file for your exact model code (thor). Flashing the wrong firmware can brick the device, so always confirm the model code before flashing.
Are these Xiaomi 12S Ultra ROM downloads free?
Yes. Every Xiaomi 12S Ultra firmware file on ROM Palace is free to download with a direct link — no subscription and no waiting queue.
What problems can Xiaomi 12S Ultra stock firmware fix?
Stock firmware fixes bootloops, a device stuck on the logo, software crashes, failed OTA updates, can remove FRP, repair a corrupt or null IMEI, and restore the Xiaomi 12S Ultra to its original factory software.
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