How to know exactly the date of production of the Xiaomi phone: from the box to hidden menus

Determining the production date of a Xiaomi smartphone is a critical step before buying a used device or checking the warranty period. Even in a new phone, a difference of several months between batches can mean different versions of iron, battery or firmware. For example, the Redmi Note 11, released in early 2022, could be equipped with a Snapdragon 680 processor, and the autumn batches of the same year – already Helio G96 with other specs.

In this article, we'll take a look at all the official and covert methods, including serial number decoding, IMEI verification, factory packaging analysis, and even engineering menus, how to tell the 2023 release from 2022, why the date on the box might not match the real one, and what to do if the serial is erased, and at the end, a date code matching table for popular Xiaomi, Redmi, and POCO models.

Serial number verification: decoding of date code

The serial number (S/N) is the main identifier of the device, which contains encrypted information about the date of production. Xiaomi's serial format depends on the year of release:

• 📅 Old format (until 2019): 11 characters, where the 5th and 6th are a year, the 7th and 8th are a month: 8QFG19031234 → March 2019.
• 📅 New format (from 2020): 14-16 characters, where the 4th and 5th are the year, the 6th and 7th are the month: KL32207M4567 → July 2022.
• ⚠️ Exceptions: Models POCO F3 Xiaomi 11T Pro date can be encrypted in 3-4 characters (needs an online decoder).

Where to find the serial number:

• 📱 In settings: Settings → The phone. → General information → Serial number.
• 📦 On the box: under the barcode or on the sticker with IMEI.
• 🔋 Under the battery (for collapsible models): on the sticker of the motherboard.

⚠️ Warning: If the serial number on the box and in the phone settings do not match, this may indicate a change of case or unoriginal packaging.

Make sure the serial is not erased and clearly visible |Convert the format with the table below |Use the online decoder for new models |Chronize the date match on the box-->

2.Date of production by IMEI: myths and reality

IMEI (International Mobile Equipment Identity) is a unique identifier for a phone, but does not contain direct release date information, but it can indirectly determine the age of the device:

• 🔍 First 8 digits (TAC-For example, 86952904 corresponds to the Redmi Note 10 Pro 2021.
• 📡 The last 6 digits are the serial number of the batch. The larger they are, the later the phone is released (but this is not an exact rule).

How to check for IMEI:

1. On the phone keyboard, type: *#06#.
2. Look at the sticker under the battery (for older models).
3. Use services like IMEI.info to decrypt TAC-code.

IMEI doesn’t give an exact date, but it does help to identify a fake: if a phone gives an IMEI from another model (for example, a Redmi 9 instead of a Redmi Note 9 Pro), it’s 100% fraud.

B-phone|New phone|Never checked.|Only if you have doubts.-->

3. Factory packaging: where to look for the date and what to look for

The Xiaomi box contains a few date tags, but not all of them indicate the actual age of the phone.

⚠️ Critical moments:

• 📦 If the date on the box is older than the date in the serial number, the phone could be repackaged (risk of forgery).
• 🔄 Stickers from IMEI/SN The box and the phone must match, and the discrepancies are a sign of service repair or fraud.
• 🌍 Boxes for Global (Global) and Chinese (CN) Different versions – check the region!

Hidden menus and engineering codes: factory data

Xiaomi phones have hidden menus where you can find factory data, including the production date.Caution: Not all codes work on new models (e.g., Xiaomi 13 or Redmi Note 12 can block access).

Major teams:

• 📅 ##4636## → Phone information → Field Assemblance Date (not always exact).
• 🔧 ##225## → Calendar info (shows the date of calibration of modules).
• 📡 ##6484## → MTK Engineer Mode → Hardware Testing → Version (for phones on MediaTek).

For phones on Qualcomm Snapdragon:

1. Install the CPU-Z application.
2. Go to the System tab.
3. Check out the Build Date field – this is the firmware build date, not the phone!

⚠️ Note: Entering engineering codes on some models (POCO F5, Xiaomi 12T) Do not use the codes on phones with an unlocked bootloader - this can lead to blocking IMEI.

5. Online services for verification: which are working in 2026

Official and third-party services allow you to check the production date by serial number or IMEI. However, many of them are either outdated or require payment.

• 🔗 Xiaomi’s official service checks originality, but does not show date.
• 🔗 SNDeeper – Decrypts serial numbers (free, but not for all models).
• 🔗 IMEI24 — check-up IMEI (cost ~$1, shows the date of activation, not production!).

How to avoid fraud:

• 🚫 Do not trust the services that are asked to enter IMEI + email – it could be phishing.
• 📌 Check the data from several sources (serial) + box + engineering menu).
• 💳 Do not pay for the check if the service has no feedback on forums (for example, 4PDA).

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If a seller refuses to provide a serial number or IMEI before buying, it is a reason to doubt the fairness of the transaction.

Physical examination: Indirect indications of phone age

Even without a serial number, you can roughly determine the age of Xiaomi by external signs:

• 🔋 Battery: If the phone is more than 2 years ago, but the battery shows wear and tear <20% — It's probably changed. Battery sticker with date. YY/MM) This indicates a month of battery production, not a phone.
• 📱 Body and buttons: Models from 2020 to 2021 (e.g. Redmi Note 9) have matte coatings that wear off in 1-2 years of active use. On/volume buttons on phones 2023+ (Xiaomi 13, POCO F5) have metal inserts, in old models they are completely plastic.
• 🔌 Charging port: Phones up to 2022 often use Micro-USB (e.g. Redmi) 9A). Models 2022+ switch over USB-C, Some budgetary lines (Redmi) A1) They still keep the old jack.

⚠️ Important: Scratches on the screen or scuffs on the body do not always indicate age - the phone could be actively used for several months. → Battery → Battery status).

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The most reliable way is to combine serial number + date on the box + check through an engineering menu. One method can give inaccurate information, but the coincidence of three sources confirms authenticity.

Table of date code correspondence for popular models

Below are the current serial number formats and decryption examples for Xiaomi, Redmi and POCO lines (data for 2026):

🔍 How to use the table:

1. Find your model (or similar in line) in the list.
2. Check the length of the serial number.
3. Select the symbols corresponding to the date (see the column "Date position").
4. Decipher the YYMM format (year/month).

If your model is not specified, use SNDeeper or ask a question on the MIUI SU forum.

FAQ: Frequent questions about Xiaomi's production date