How to know exactly the date of manufacture of the Xiaomi Redmi phone: from serial number to hidden menus

Have you just bought a Xiaomi Redmi from a hand or in an unofficial store and you're wondering if it's real? Or are you looking to see if you've been sold a "cat in a bag" instead of a new smartphone? The date of production isn't just numbers: it's the warranty period, battery life, even the market price of the device. Unfortunately, sellers often hide this parameter, and it's not directly displayed in the smartphone settings.

In this article, we will discuss all the working methods for determining the date of manufacture of Xiaomi Redmi - from decrypting the serial number to checking through the engineering menu. You will learn what methods work for the Redmi Note 10/11/12, Redmi 9/10/13C and other lines, as well as how to distinguish the original date from the fake. At the end of this article, a table of correspondence of codes and months, which will be useful for self-decryption.

1. Decoding of the serial number (IMEI/SN) — most accurate

The serial number (SN) and IMEI are unique identifiers for your Xiaomi Redmi that encrypt the production date. On Redmi models after 2018, the date is encoded in YYMM (year and month) format and is usually in 5-8 characters of the serial number. For example, the SN K63A5210312345 encrypted the date March 2021.

Where to find the serial number:

• 📦 On the phone box (barcode sticker on the end or bottom)
• 📱 In settings: Settings → The phone. → General information → Serial number.
• 🔋 Under the battery (for models with a removable lid, for example, Redmi) 4A/5A)
• 🖱️ By computer: connect your phone in Fastboot mode and type in the command fastboot getvar all (date will be in the serialno line)

How to decrypt the code:

1. Take the serial number (example: M2004J19C20071234)
2. Select 4 digits after the letter prefix (here 2007)
3. The first 2 digits are a year (20 = 2020), the last 2 digits are a month (07 = July)

⚠️ Note: Fake Xiaomi serial numbers are often forged! check originality through official service mi.com/verify (enter IMEI or SN). If the site makes a mistake, you have a clone.

IMEI Verification: Online Services and Their Limitations

IMEI (International Mobile Equipment Identity) is another way to know the release date, but with reservations: Xiaomi does not officially disclose the production date through IMEI, but some third-party services (such as IMEI.info or IMEI-Pro) can show an approximate year based on the database.

How to check:

1. Find it. IMEI: 📞 Type *#06# and a window with a 15-digit code will appear. 📄 Look at the sticker under the battery or on the box ⚙️ In settings: About the phone → General information → IMEI

Manufacture Date

Age

What's important to know:

• ⚠️ Services show first owner activation date, not production! the difference can be up to 6 months.
• 🔍 For Redmi. 2022-2026 Data may not be available in the past year – databases are updated slowly.
• 💰 Pay for the “extended check” is not worth it – free information is enough.

3.Date on the box and stickers: where to look and how not to make a mistake

The original Xiaomi Redmi packaging contains three key labels with a production date:

1. Barcode sticker (end of the box) – look for the MFD (Manufacture Date) string in YY/MM/DD or YYMMDD format.
2. White sticker at the bottom of the box - may contain code type 23W30 (30th week 2023).
3. The serial number on the box is decrypted in the same way as the phone's SN.

Examples of real labels:

⚠️ Note: If the date on the box and the serial number do not match, this is a sign of repackaging (often from gray suppliers.

💡

Take a picture of all the stickers on the box before you buy, which will help prove the switch if the seller has hidden the real age of the phone.

4. Engineering menu and hidden codes: for advanced users

Xiaomi’s hidden menus allow you to get technical information, including production date, which works on all Redmi models, but you need to be careful – do not change the settings in the engineering menu!

Instructions:

1. Open the Phone app and type in: ##4636## Select Phone Information.
2. Scroll down to Hardware info. Look for the lines: Manufacture date - date in MM/DD/YYYY Build time - firmware build date (may vary by 1-2 months)

Qualcomm

Redmi Note 12 Pro+

##225##

In the Calibration section, the Manufacture Date line will be used.

Alternative way (for Redmi on MediaTek):

• Enter #36446337## (EngineerMode opens)
• Go to Hardware Testing → Version
• Find a Manufacture Date or RF Calibration Time

5. Verification through MIUI: hidden files and logs

MIUI stores production logs in service files, a method that is suitable for phones that are already activated and have not undergone deep flashing.

How to find a date in MIUI:

1. Install a file manager with root access (such as FX File Explorer or Solid Explorer).
2. Cross the path: /data/local/tmp/ Look for files with names: factory_log.txt — The Manufacture Date line is rf_calibration_data — calibration (≈ date)

Redmi

/vendor/build.prop

Ro.vendor.build.date.utc (Date in Unix-time format, convert via epochconverter.com)

If you do not have root rights, use ADB:

1. Connect your phone to a PC with an Android SDK installed.
2. Enter the command: adb shell getprop ro.vendor.build.date or adb shell cat /vendor/build.prop | grep "build.date"

💡

The date in MIUI files can indicate the firmware date, not the production date! Compare it to the data from the serial number or box.

Indirect evaluation: battery, firmware, equipment

If none of the above methods worked, the date of production can be estimated by indirect indications:

Battery condition:

• 🔋 Enter the phone ##4636## → Battery information. Compare Level (current charge) and Health (health). < 85% at age 1 - the production date is likely to be older.
• 📊 Use the AccuBattery app (showing real wear and age of the battery).

Firmware version:

• 📱 Go to Settings. → The phone. → Version. MIUI. The first firmware for the model came close to the date of production, for example, if the Redmi Note 11 is worth a lot of money. MIUI 12.5, and the current version is 14, the phone was released at least a year ago.
• 🔍 Check the firmware assembly date in Settings → The phone. → The kernel version (Mon Jan 1 format 12:00:00) CST 2023).

Component:

• 🔌 Check the charger: the original Xiaomi blocks have a production date (e.g., a production date, 2022-08 label).
• 🎧 Headphones and cable included are also marked with a year (look for plastic connectors).

Design and marking:

• 🏷️ On the back of Redmi, look for the word Designed by Xiaomi with a year (e.g., a year, ©It's not a production date, but it helps cut off models that are too old.
• 🔍 Compare the look of the phone with the official photos on the Xiaomi website – the manufacturer often changes the design of the packaging and accessories.

7. Frequent mistakes and how to avoid them

When determining the production date of Xiaomi Redmi, users often encounter traps:

Fake serial numbers:

• 🛡️ Xiaomi clones often have SN 1234567890 or repeating characters.
• 🔍 If the serial number on the box and the phone don’t match, it’s 100% fake.

2. Incorrect decryption of the code:

• ❌ Mistake: counting 2007 in SN as 2020, July (correct: 2020, 07 month) = July).
• ❌ Mistake: Ignore the letter prefix (e.g., in the M2004J19C2007 Only numbers after letters are important).

Date of activation vs. date of production:

• 📅 Services like IMEI.info show the date of first activation rather than release, with a difference of up to 1 year (e.g., the phone released in December 2022 and activated in March 2023).

Modified firmware:

• 🛠️ If the phone was reflashed, the date in build.prop may indicate the software version, not the production.
• 🔧 Check the originality of the firmware through Settings → The phone. → Version. MIUI. If the version does not match the model (for example, Redmi 9 is firmware from the POCO X3) — data is unreliable.

💡

If the seller refuses to show the box or serial number, it is a reason to doubt the honesty. ask for a photo of the stickers with MFD or video with the input *#06#.

FAQ: Answers to Frequent Questions