Redmi A5 / POCO C71 (serenity) MIUI A15 Android 15 Go Fastboot ROMs – Global, India, Russia, EEA & Indonesia
The Redmi A5 / POCO C71 (codename serenity) is an entry‑level Android 15 Go smartphone powered by the Unisoc T7250 (T615) octa‑core chipset, pairing two Cortex‑A75 performance cores and six Cortex‑A55 efficiency cores with a Mali‑G57 MP1 GPU for smooth everyday use at a budget price. It features a 6.88‑inch HD+ 120 Hz display, up to 6 GB RAM and 128 GB storage, a 32 MP rear camera, 8 MP front camera and a 5200 mAh battery, giving users a large screen and modern design for social media, calls and light gaming.
In practice, owners report common problems such as faster‑than‑expected battery drain, Android Go performance limits, confusion around battery protection/charging to 80–100 %, and occasional lag or slow boots, which are often tied to software configuration rather than hardware defects.
The official MIUI A15 stable fastboot ROMs listed here (A15.0.x.0 builds for Global, India, Russia, EEA and Indonesia) deliver updated security patches and system stability improvements that help resolve many of these software‑side issues and restore a clean, stock system on Redmi A5 / POCO C71 devices.
Redmi A5 / POCO C71 Firmware Details
| Device Name | Redmi A5 / POCO C71 (Android 15 Go) |
|---|---|
| Codename | serenity – shared by Redmi A5 and POCO C71 variants. |
| Model Identifiers | Redmi A5 models like 25028RN03A/L/Y/I and POCO C71 models such as 25028PC03G/I; confirm on the box, back cover and in Settings → About phone. |
| Chipset | Unisoc T7250 (T615), 12 nm, octa‑core CPU (2 × Cortex‑A75 @ up to 1.8 GHz + 6 × Cortex‑A55 @ up to 1.6 GHz), Mali‑G57 MP1 GPU and integrated 4G LTE modem. |
| Display | 6.88‑inch HD+ notch display (around 720 p) with up to 120 Hz refresh rate, tuned for smooth scrolling on a large budget panel. |
| Battery | Approx. 5200 mAh battery, giving solid endurance for light use but still prone to faster drain with heavy data, games or many background apps. |
| Cameras | Single 32 MP main rear camera and 8 MP selfie camera (as per tests and reviews), enough for basic photos and social media. |
| Software Base | Android 15 (Go edition) with MIUI A15 skin; these A15.0.x.0 builds are stable MIUI / HyperOS‑line firmwares for serenity. |
| Main Issues Reported | Users note high battery drain under moderate‑heavy usage, slow response times or lag in some apps, confusion over 80–100 % charging limits, and occasional long boot times after plugging in. |
| What These A15.0.x.0 Builds Improve | MIUI A15.0.14.0.VGWMIXM and related regional builds update Android 15 security patches (for example to November 2025 globally) and increase system security and stability, helping reduce random bugs and crashes. |
| Flash Method for These Files | Fastboot .tgz images intended for Xiaomi Mi Flash Tool on Windows or for fastboot‑script flashing (flash_all.bat style) once the bootloader is unlocked. |
| Bootloader Status | Official HyperOS/MIUI sites note that you must unlock the bootloader to flash via fastboot; OTA/Recovery updates do not require unlocking. |
| Best Use Cases | Cleanly updating to newer MIUI A15 builds, fixing bootloops after failed OTAs, solving deep software corruption or severe lag, and returning heavily modified Redmi A5 / POCO C71 units back to stock. |
Download Official Firmware for Redmi A5 / POCO C71 (serenity)
The firmware table below lists all provided MIUI A15 fastboot ROMs for Redmi A5 / POCO C71 (serenity), organized by region so you can choose the correct package for your exact variant.
| Filename | Region / Variant | Android / MIUI | Build Version | Type | Size | Build Date | Recommended Use | Download |
|---|---|---|---|---|---|---|---|---|
| serenity_global-images-A15.0.14.0.VGWMIXM-user-20251108.0000.00-15.0-global-630ac1f5b7.tgz | Global Redmi A5 / POCO C71 (MIXM branch). | Android 15 Go / MIUI A15.0.14.0. | A15.0.14.0.VGWMIXM (Global Stable Fastboot). | Official fastboot ROM (.tgz). | ≈4.4–4.7 GB (compressed). | 2025‑11‑08 internal build; security patch noted as November 2025. | Ideal for most global serenity units needing latest security patch, bug fixes, or a full clean install to solve lag, battery drain bugs, or boot issues. | Download A15.0.14.0.VGWMIXM (Xiaomi BigOTA) |
| serenity_in_global-images-A15.0.12.0.VGWINXM-userroot-20251010.0000.00-15.0-in-9e7bf3be2c.tgz | India Redmi A5 / POCO C71 (INXM branch). | Android 15 Go / MIUI A15.0.12.0. | A15.0.12.0.VGWINXM (India Stable Fastboot). | Official fastboot ROM (.tgz). | ≈3.26 GB (compressed). | 2025‑10‑10 internal build; rolled out to Indian serenity users in Q4 2025. | Best for Indian models when OTA fails, a soft brick occurs, or a manual upgrade / clean reinstall is required. | Download A15.0.12.0.VGWINXM (Xiaomi BigOTA) |
| serenity_ru_global-images-A15.0.8.0.VGWRUXM-user-20251010.0000.00-15.0-ru-316f1a0ff7.tgz | Russia Redmi A5 / POCO C71 (RUXM branch). | Android 15 Go / MIUI A15.0.8.0. | A15.0.8.0.VGWRUXM (Russia Stable Fastboot). | Official fastboot ROM (.tgz). | ≈3.37 GB (compressed). | 2025‑10‑10 internal build; part of the 2025 Russian MIUI A15 rollout. | For Russian units that need to recover from failed updates or heavy software glitches while staying on the local RUXM branch. | Download A15.0.8.0.VGWRUXM (Xiaomi BigOTA) |
| serenity_eea_global-images-A15.0.10.0.VGWEUXM-user-20251108.0000.00-15.0-eea-997be950c3.tgz | EEA / Europe Redmi A5 / POCO C71 (EUXM branch). | Android 15 Go / MIUI A15.0.10.0. | A15.0.10.0.VGWEUXM (EEA Stable Fastboot). | Official fastboot ROM (.tgz). | ≈3.65 GB (compressed). | 2025‑11‑08 internal build; security patch updated around November 2025 for Europe. | Recommended for European models when doing a full system refresh or manual move to the latest MIUI A15 EEA release. | Download A15.0.10.0.VGWEUXM (Xiaomi BigOTA) |
| serenity_id_global-images-A15.0.7.0.VGWIDXM-user-20251028.0000.00-15.0-id-d3a948e0a8.tgz | Indonesia Redmi A5 / POCO C71 (IDXM branch). | Android 15 Go / MIUI A15.0.7.0. | A15.0.7.0.VGWIDXM (Indonesia Stable Fastboot). | Official fastboot ROM (.tgz). | ≈3.63 GB (compressed). | 2025‑10‑28 internal build; appears in Indonesian ROM lists in Q4 2025. | Suited for Indonesian serenity users to fix bootloops, heavy lag or broken OTA paths while staying on the IDXM branch. | Download A15.0.7.0.VGWIDXM (Xiaomi BigOTA) |
Flashing Requirements
- Backup everything: Fastboot flashing usually performs a clean install and wipes apps, accounts and internal storage, so back up photos, chats and documents to a PC or cloud first.
- Charge the phone: Ensure your Redmi A5 / POCO C71 has at least 50–60 % battery before starting to avoid shutdown during flashing.
- Windows PC & USB cable: Use a stable Windows computer with updated Xiaomi/Unisoc USB drivers and a good‑quality USB‑C cable for reliable data transfer.
- Confirm codename & region: In Settings → About phone or via fastboot getvar product, confirm codename serenity and match the region suffix (MIXM / INXM / RUXM / EUXM / IDXM) to the firmware you select.
- Unlock the bootloader: Official HyperOS/MIUI documentation notes that bootloader unlock is required to flash fastboot ROMs; locked devices should normally update via OTA or Recovery.
How to Flash the Firmware
Method 1: Xiaomi Mi Flash Tool (Fastboot ROM)
- Prepare tools & firmware: On your Windows PC, install Xiaomi USB drivers and the Xiaomi Mi Flash Tool, then download and extract the correct serenity_*_images-A15.0.x.0… .tgz file into a folder.
- Load the fastboot package: Open Mi Flash, click the firmware selection button and choose the extracted serenity fastboot folder so all partitions are loaded automatically.
- Enter fastboot mode: Power off the phone, then hold Volume‑Down + Power to enter fastboot mode and connect the device to the PC with a USB‑C cable.
- Start flashing: Ensure Mi Flash detects your Redmi A5 / POCO C71, select a safe option such as “clean all”, then start the flash and wait until Mi Flash shows a success status without disconnecting the cable.
- First boot: Reboot the phone; the first boot after installing a new A15.0.x.0 build can take several minutes while Android 15 Go and MIUI optimize apps and services.
For a detailed fastboot walkthrough with screenshots, driver links and troubleshooting tips, follow this full tutorial: Full Guide: Flash Xiaomi Smartphone Firmware with Mi Flash Tool.
Method 2: Fastboot Script (flash_all.bat)
- Install platform tools: Set up Android platform‑tools on your PC, then extract the chosen serenity fastboot ROM so that the .bat scripts and image files are in one directory.
- Connect in fastboot: Boot the phone into fastboot mode, connect via USB and run fastboot devices to confirm that your Redmi A5 / POCO C71 is detected by the PC.
- Run the script: Execute flash_all.bat (or the appropriate script in the ROM folder) to automatically flash all required partitions; do not unplug the cable or close the window until it finishes.
- Let it reboot: After the script completes, the phone should reboot into MIUI A15; if not, long‑press Power once to restart and wait for the boot process to complete fully.
- Restore & test: Go through setup, restore backups, then monitor battery life, charging behavior and performance over several days to confirm that previous battery‑drain or lag issues have improved.
If you ever work with separate Unisoc .pac service firmware files instead of Xiaomi’s fastboot packages, follow this dedicated Unisoc SPD Upgrade Tool guide: How to Flash Firmware with the SPD Upgrade Tool (Unisoc).
Frequently Asked Questions (FAQs)
What Redmi A5 / POCO C71 problems can these MIUI A15 fastboot ROMs fix?
Flashing the correct serenity fastboot ROM can recover phones stuck in bootloops after a failed OTA, repair unstable systems that frequently crash, and clear deep software corruption from heavy modifications or malware. Many users also find that a clean, updated install improves random lag and minor bugs compared with heavily used or outdated builds.
Can these updates help with battery drain and heating?
High battery drain and performance slowdowns are common complaints on Redmi A5 / POCO C71, especially with lots of background apps on Android 15 Go and a power‑hungry T7250 SoC. The newer A15.0.14.0 / A15.0.12.0 and related builds focus on updated security and system stability, which can reduce random wakelocks and glitches, but optimal battery life still depends on realistic app usage and Go‑edition expectations.
Why does my Redmi A5 stop at 80 % or seem slow to charge?
Redmi A5 / POCO C71 models include battery protection and safety logic that can cap or slow charging near 80–100 % in some conditions, which may look like an “80 % limit” or very slow finish. This behavior is usually normal and is not fixed by flashing; check battery‑care settings and charging conditions before assuming a firmware fault.
How do I choose the right file for my Redmi A5 or POCO C71?
In Settings → About phone, confirm the device name (Redmi A5 or POCO C71) and codename serenity, then match the region suffix: MIXM for global, INXM for India, RUXM for Russia, EUXM for EEA/Europe and IDXM for Indonesia. Never flash a build with a different codename or region, as this can cause network, SIM or stability issues and may brick the phone.
