How to check the production date of the Xiaomi Redmi phone: a step-by-step guide

Buying a Xiaomi Redmi smartphone in the secondary market or even in an official store is often accompanied by the question: how to find out the real age of the device? The date of production affects not only the wear and tear of the gadget, but also the state of the battery, warranty period, and sometimes compatibility with the latest firmware versions. The manufacturer does not always indicate this information openly, but it can be calculated in several ways.

In this article, we will discuss 5 working methods for checking the release date of the Xiaomi Redmi, from decrypting the serial number to analyzing the factory packaging. You will learn what data IMEI hides, how to read the label on the box and what the first digits in the device number mean, and also why some methods can give inaccurate results and how to get around it.

1. Checking the date by serial number (S/N)

The most reliable way to determine the age of Xiaomi Redmi is to decrypt the serial number, which is encrypted according to the manufacturer's standard, which is unique for each device and contains information about the month and year of assembly.

• 📱 In the phone settings: Settings → The phone. → General information → Serial number.
• 📦 On the box: usually on a barcode sticker (field) S/N)
• 🔋 Under the battery: on some models (e.g. Redmi Note) 4X)

Xiaomi serial number has a format XXXXXXXXXYYWW, where:

• YY is the last two digits of the year (e.g. 20 = 2020)
• WW – week of production (01 to 52)

Example: Serial number 8A341C5D2035 stands for 20 = 2020, 35 = 35th week (late August), which means the phone is released in August 2020.

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If the serial number starts with letters (such as MZC), ignore them – the date is encrypted only in the numbers at the end.

⚠️ Note: On Redmi 2023 and later, the serial number format may differ.If the last 4 digits do not correspond to the year/week (for example, 2350), use alternative methods from this article.

2. IMEI date transcript

IMEI (International Mobile Equipment Identity) is a unique phone identifier that can also contain release date data, but unlike the serial number, it's implicitly encrypted to extract it:

1. Find out your Redmi's IMEI: Dial on the keyboard *#06# and the 15-digit code will appear. Look at Settings → Phone → General information → IMEI. On the box or under the battery (for older models).

8 digits

86372404

IMEI.info

SNDeeP

Unfortunately, the IMEI itself does not contain direct data on the date of production - it only helps to determine the country of manufacture (first 2 digits) and the model (next 6 digits).

⚠️ Attention: If IMEI It starts at 00 or contains repeating numbers (e.g. 1111111111111), which could mean it's faked or dropped.

Yes, always | Only if I doubt the seller | No, I don't see the point | Check, but don't give a meaning-->

3.Date on factory box

The original Xiaomi Redmi packaging contains several markings that can be used to determine the date of production.

• 📅 Barcode sticker: usually contains a string of format YYMMDD (Year, month, day, for example, 210815 = 15 August 2021 year-end.
• 🏭 The game code: It may look like 2020W35 (35th Week 2020).
• 📦 Certification Date: Some boxes indicate the month and year of quality control (usually 1-2 months before the actual release).

Please note the location of the date:

If the date is laser-painted or engraved, the box is original.

If the date is printed in paint and blurred, a fake is possible.

On the Redmi models 2022-2026, the date on the box may not be available – in this case, use the serial number or IMEI. Also check if the model on the box matches the one in the phone settings (sometimes sellers swap packages).

4. Check through the engineering menu (for advanced)

If the serial number and box are not available, you can try to find out the production date through Xiaomi’s engineering menu, which does not work on all models, but can provide additional information about the firmware and hardware version.

1. Open the phone app and dial: ##4636##
2. In the menu that opens, select Phone Information.
3. Scroll down to the Hardware info block – look for Manufacture date or Build time lines.

In some firmware, the date may be displayed in YYYYMMDD format (e.g., 20210315 = March 15, 2021).However, this setting shows the firmware build date rather than the phone itself - the difference can be from a few days to months.

Alternative code for new Redmi models (e.g. Redmi Note 12):

##284##

After entering, a testing menu will open, where the production date can be specified in the Version section.

⚠️ Warning: Do not change the settings in the engineering menu unless you are sure of their purpose! Incorrect actions can lead to loss of warranty or software failure.

5. Online services for verification

If manual methods do not help, you can use specialized services that analyze Xiaomi data on the manufacturer's database.

• 🌐 Xiaomi’s official verification tool – requires input IMEI or S/N. Shows the activation date and warranty status.
• 🔍 SNDeeP – Deciphers serial numbers and shows country of production.
• 📊 IMEI24 — Gives an approximate year of release according to the first figures IMEI.

Example of the report from SNDeeP for Redmi 9A:

Model: Redmi 9A (M2006C3LG)




Manufacture Date: 2020-11 (November 2020)




Country: China

Note that some services may show a certification date rather than a production date, which is usually 1-3 months early.

Before using online services, check:

- Is the site reliable (see forum reviews, such as 4PDA).

Does the service request extra data (passwords, email).

Do the results match with other methods (serial number, box).

Compare serial number and IMEI on the box and in the phone | Check the phone for authenticity through the official website Xiaomi| Contact the seller for explanations | Use 3-4 methods for cross-checking-->

6. Indirect indications of the age of the telephone

If none of the methods worked, you can estimate the age of Xiaomi Redmi by indirect signs:

• 🔋 Battery status: Go to Settings → Battery. → Battery status: If the capacity has dropped below 85% of the original, the phone is likely to be older than 2-3 years.
• 📱 Android Version: Outdated models (like Redmi 5) don’t support new OS versions. → The phone. → Android version.
• 🛠️ The presence of repair traces: Unscrewed screws, scratches under the lid, unoriginal stickers - signs that the phone has been in the service.
• 📦 Original headphones, cable and power supply Xiaomi change the design every 1-2 years.

Also note the date of first activation in your Mi Account (if the phone is tied):

Go to Settings → Xiaomi Account → Devices.

Find your model and look at the date in the First Connection line.

This method only works if the phone hasn't been reset to the factory settings. After the reset, the date is reset.

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If the phone was released more than 3 years ago but looks like a new one, chances are it has been recovered after a major breakdown (replacement of the board, battery) and check it for all modules (camera, speakers, sensors).

Frequent Mistakes and How to Avoid Them

When checking the production date of Xiaomi Redmi users often encounter false data.

1. Fake serial number: The sticker on the box or phone could have been replaced. Always check the S/N in the settings and on the package.
2. Model mismatch: The seller can issue the Redmi Note 8 for the Note 9. Check the model in Settings → About the phone → Model and on the box.
3. Outdated data in online services: Bases like IMEI.info don't always get updated. If the service is in 2019 and the phone is clearly newer, use other methods.
4. Date confusion: A date on a box could mean manufacturing a pack, not a phone (especially with resellers).

To minimize the risks:

Buy phones only from official sellers (Mi Store, Svyaznoy, M. Video).

Require the seller a photo of the box and stickers before buying (on Avito or Yula).

Check your phone for IMEI blacklists (may have been stolen).

FAQ: Answers to popular questions