How to check the year of release of the Xiaomi Redmi phone: official and hidden methods

Buying a Xiaomi Redmi smartphone in the secondary market is always fraught with risks: the seller can hide the real age of the device, and the appearance does not always give the true date of production. Knowing the exact release year helps to assess the residual battery life, the relevance of the hardware platform and even the market value of the gadget. For example, the Redmi Note 10, released in early 2021, by 2026, can lose up to 30% of the battery capacity – a critical factor in choosing.

In this article, we will discuss 5 working ways to verify the production date of Redmi – from serial number analysis to hidden MIUI service menus. You will learn how to distinguish the original box from a fake, what numbers in the model number indicate a month of build, and why data from Settings → Phone is often lied about.

1.Serial number: decoding according to the Xiaomi standard

The main way to determine the age of Redmi is to examine the serial number (IMEI or SN), It's encrypted using Xiaomi's universal algorithm, and since 2018, the company has been using the format. YYYYMMDDXXXXXX, where:

• 📅 YYYY — year of production (e.g. 2021 for Redmi Note 10 Pro)
• 🗓️ MM — month (01 to 12)
• 📦 DD — day (can be replaced by factory code)
• 🔢 XXXXXX — unique identifier of the device

Where to find the serial number:

• 📱 Settings menu → The phone. → General information
• 📄 On the sticker under the battery (for models with removable battery)
• 📦 On the box (see section 2 on counterfeiting)
• 🔌 The command *#06# (shows) IMEI, partially duplicated SN)

An example of decryption:

Serial number. 20210315A1B2C3 It means that Redmi is released on March 15, 2021, but for Redmi 12 (2023) and newer models Xiaomi can use a shortened format without a day - only a year and a month (2308XXXXXX = 2023).

⚠️ Note: If the serial number starts with 0000 or repeating digits, you are looking at a fake or a device with a flashed bootloader.

2. Box and stickers: where to look for the production date

Redmi’s original packaging contains three sources of release date information:

1. Barcode on the back: underneath it is hidden production code in WYYWW format, where: W is the week of the year (01 to 52) YY is the last two digits of the year (for example, 21 = 2021)

IMEI sticker

Printed date

Printed in China 05/2023

It's not the phone's production date.

How to distinguish the original box:

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If the box is missing, ask the seller for a photo of the stickers under the battery (for models with a removable battery) or a screenshot from the Settings menu → About the phone. Compare the serial numbers on the phone and in the documents - they must match.

3. Service codes and hidden MIUI menus

MIUI firmware contains hidden diagnostic tools where you can find the date of production, and these methods work even if the serial number is erased or forged.

Method 1: Engineering menu

1. Open the Phone app and type ##4636##.
2. Go to the tab Information about the phone.
3. Scroll to the Build Date block - MM-DD-YYYY format.

Method 2: Testing menu

1. Enter ##284## (for Redmi on Qualcomm processors).
2. Select Version Info → Manufacture Date.

Limitations:

• ❌ On Redmi with MediaTek (e.g. Redmi) 9A) The codes may not work – use the alternative: ##36446337##.
• ❌ After flashing the date in the menu can be reset to the current.

4.Official Xiaomi services: check by IMEI

Xiaomi provides two legal authentication and release date tools:

1.The [Mi Verify] website(https://www.mi.com/global/verify)

• 🌐 Enter. IMEI or serial number in the field of inspection.
• 📅 The system will show the activation date (not to be confused with the production date!). for new phones, the difference is 1-6 months.
• ⚠️ The service may not work for devices purchased in China (models with the C suffix in the room).

2.The Mi PC Suite app.

1. Connect Redmi to your computer via USB.
2. Launch the Mi PC Suite and go to Device →
3. Find the Manufacture Date line.

Important: Official services show the date of first activation, not assembly. If the phone has been in storage for 6 months, the difference will be significant. For accuracy, combine this method with a serial number check.

5. Hardware features: how to determine the age by "iron"

If software methods are not available (e.g., the phone is not turned on), look for physical markers:

Battery:

• 🔋 The battery sticker contains the date in format YYYY-MM-DD (for example, 2022-07-15).
• 📉 If the battery capacity (in Settings) → Battery) less than 85% of the declared – phone over 2 years old.

Processor and memory:

• 🖥️ Use the app. CPU-Z For example, the Redmi Note 11 (2022) was equipped with a Snapdragon 680, and the Redmi Note 11 Pro.+ — Dimensity 920.Confirm with the official specs.
• 💾 Type of memory: UFS 2.2 was introduced in 2021 (Redmi 10 and newer models).

Display:

• 📱 Redmi 2020–2021 had 60 Hz screen, and with 2022 Redmi Note of the Year 11S and above) have moved to 90/120 Hz.
• 🔍 Check for yellow spots on the AMOLED-screens - a sign of aging organic LEDs (typical for devices older than 3 years).

⚠️ Note: If the motherboard does not have a marking with a date (format) WYYWW), The serial number is erased, and you're either a fake or a phone after a major repair (e.g. after a flood) that's often sold as "new" in the secondary market.

6. Frequent errors and myths in the verification

When determining the age of Redmi, users encounter common misconceptions that lead to incorrect conclusions:

Myth 1: “Date in phone settings is the date of production”

📱 Settings menu → The phone displays the build date of the firmware, not the device. 9T firmware 2023-05-10 could have been released 2021 year.

Myth 2: “All Redmis are new from China”

🏭 Chinese versions (CN In the model number, you often lie in warehouses for 6-12 months.

Myth 3: “IMEI shows the exact year”

🆔 IMEI It only contains information about the model and the country, not the date (SN) — the only reliable source.

Myth 4: “If the phone was in the box, it’s like new.”

📦 Even a non-activated device ages: electrolytes in the battery degrade and rubber seals lose elasticity.Redmi over 2 years old requires battery replacement even at zero charge cycle.

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The serial number and battery sticker are the only 100% reliable sources of production date, and all other methods (including official Xiaomi services) can give a margin of error of up to 6 months.

FAQ: Answers to Frequent Questions