Redmi 12C / POCO C55 Official HyperOS Fastboot Firmware

Redmi 12C and POCO C55 are budget Xiaomi smartphones built around the MediaTek Helio G85 platform, aimed at entry-level users who still need a large display and all‑day battery for everyday apps and light gaming. These models use the codename earth for HyperOS and MIUI builds, and receive full Fastboot ROMs for service recovery as well as standard OTA and Recovery updates. Reliable access to untouched Fastboot packages is particularly important on this device family because many users experiment with region switching and bootloader unlocking to access additional features or faster update cycles.

For earth-based variants, common software issues include bootloops after unsuccessful updates, instability when mixing different regional ROMs, and soft bricks caused by incorrect Magisk or custom recovery procedures on the A/B partition layout. Widespread hardware defects are not broadly reported, so most recoverable failures are software‑level and can often be addressed by a clean flash of the correct HyperOS Fastboot build.

The HyperOS 1.x Fastboot firmware files below are official Xiaomi Fastboot ROMs for Redmi 12C / POCO C55 in China, Global, EEA, India, Indonesia, Turkey, Taiwan, and Russia regions. Each package serves as a complete restore image suitable for Mi Flash or fastboot script flashing, providing a clean reinstall path, a base for returning from custom ROMs, or a way to align CSC and region configuration with the intended market firmware.

File Selection Guide

Choosing the correct earth Fastboot firmware is essential because each build is tied to a specific region code (CNXM, MIXM, EUXM, INXM, IDXM, TRXM, TWXM, RUXM) and bootloader revision. Flashing a mismatched region or a lower bootloader level can lead to failed flashes, loss of OTA updates, or in some cases a soft brick that requires further recovery steps.

• Supported device names and codename
  All listed packages are for devices using the earth codename, which corresponds to Redmi 12C and POCO C55 families (including NFC/market variants where Xiaomi maps them to earth). No other Xiaomi models should be flashed with these builds, even if they share a similar marketing name.
• Region / carrier compatibility
  The suffixes CNXM, MIXM, EUXM, INXM, IDXM, TRXM, TWXM, and RUXM denote China, Global, EEA, India, Indonesia, Turkey, Taiwan, and Russia configurations respectively. Cross‑region flashing on Helio G85 Xiaomi devices is sometimes possible for experienced users, but can affect LTE bands, VoLTE configuration, and OTA behavior, and is not officially documented as supported.
• Android base and skin
  Each file name includes 14.0, indicating an Android 14 base with Xiaomi HyperOS 1.x on top. These Fastboot ROMs contain full system, boot, vendor, product, and other partitions required to completely reinstall HyperOS on earth devices.
• Anti‑rollback / downgrade behavior
  The UCx prefix in versions like OS1.0.14.0.UCVMIXM indicates an Android 14 HyperOS branch with an associated bootloader index. Xiaomi’s exact anti‑rollback configuration for Redmi 12C / POCO C55 on HyperOS is not fully documented, so downgrading to a lower UCx or from a later bootloader revision cannot be guaranteed safe; Mi Flash or fastboot will usually block unsupported downgrades.
• Typical use cases
  These Fastboot packages are typically used for recovering from bootloops, reverting from custom ROMs to stock HyperOS, fixing devices stuck in Fastboot mode after a failed flash, and performing a clean regional reinstall before resale. They also serve as a base image when switching from MIUI 14 to HyperOS using Mi Flash in “clean all” mode for users who want a completely fresh system.

Download Official Firmware for Redmi 12C / POCO C55 (earth)

Redmi 12C / POCO C55 Device + Firmware Details

Flashing Requirements

• Back up all important data, because Mi Flash Fastboot operations on earth HyperOS ROMs almost always erase user data when using standard flash_all or “clean all” modes.
• Charge the phone to at least 60% to avoid any shutdown during flashing on the Helio G85 platform, which can be sensitive to sudden power loss when partitions are being rewritten.
• Use a Windows PC with latest Xiaomi USB and MediaTek drivers installed; Mi Flash is only available for Windows environments.
• Confirm that the bootloader is unlocked via Fastboot mode status, and that the selected Fastboot ROM’s region and version match the intended market and bootloader level.
• Use a reliable USB‑A to USB‑C cable connected directly to the motherboard port, avoiding front‑panel ports or unstable hubs, because repeated disconnects can leave earth devices stuck in a half‑flashed state.
• Disable other phone management tools (Mi Assistant, third‑party flashing utilities) during the process to prevent port conflicts with Mi Flash.

How to Flash the Firmware

1. Download the correct earth Fastboot ROM (for example, earth_global_images_OS1.0.14.0.UCVMIXM_20251027.0000.00_14.0_global_2567c8a97b.tgz) for the exact region and extract it until the images and flash scripts are visible in a single folder.
2. Install Xiaomi/MediaTek USB drivers, power off the Redmi 12C / POCO C55, then boot it into Fastboot mode (usually by holding Volume Down + Power) and connect it to the PC.
3. Open Mi Flash Tool, select the extracted firmware folder, and ensure the device is detected in the device list without errors.
4. Choose the desired flashing mode (typically “clean all” for a full reinstall; avoid “clean all and lock” unless using the correct stock region firmware and you are sure about relocking behavior).
5. Click “Flash” and wait for Mi Flash to complete the process; once the tool reports success, the device will reboot to HyperOS, with the first boot taking several minutes as the system optimizes apps.

Users who need a more detailed walkthrough for Fastboot‑style flashing on Android can follow a dedicated step‑by‑step guide with screenshots here: How to flash Android firmware using fastboot script.

Frequently Asked Questions (FAQs)

Can these earth Fastboot ROMs unbrick a Redmi 12C or POCO C55 stuck in Fastboot mode?

In many cases, a correctly matched HyperOS Fastboot ROM for earth can recover a device stuck in Fastboot mode or bootloop, as long as the bootloader is unlocked and there is no underlying hardware damage.

Is it safe to relock the bootloader after flashing a different region ROM on earth?

Relocking is typically only considered safe when flashing the official region firmware intended for the device; relocking after cross‑region flashes can lead to boot verification failures, and Xiaomi does not officially document all safe combinations for earth.

Will flashing these HyperOS ROMs on Redmi 12C / POCO C55 update the Android version?

All listed builds are based on Android 14, so devices coming from MIUI 13 or MIUI 14 on Android 12/13 will be upgraded as part of the Fastboot flash, but they cannot be downgraded back to older Android branches if bootloader/ARB rules block it.

Can a Global earth ROM be used on a China Redmi 12C to get Google services?

Cross‑flashing Global onto a China unit is technically possible for some Xiaomi devices, but it is not officially supported, may affect LTE bands and OTA updates, and carries a higher risk of boot issues on earth; this scenario should be approached only by advanced users.

Do these HyperOS builds fix known performance lag on low‑RAM Redmi 12C variants?

HyperOS updates can deliver optimizations and security improvements, but there is no official confirmation that these specific versions resolve all lag on low‑RAM earth models; perceived performance will still depend on installed apps and usage patterns.