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

You bought a used Xiaomi and you doubt the seller's integrity, or you want to see if you've been sold a repainted restyling under the guise of a new model, and the date of production is like the device's passport, which tells you the real age of the gadget, helps you avoid counterfeiting, and even predicts how long the battery will last, but where do you look if the box has erased the inscriptions and the settings don't have this information?

In this article, we’ll look at all the official and hidden ways to find out the release date of Xiaomi, from decrypting the serial number to analyzing hardware tags. You’ll learn which data can be trusted 100%, and which methods only give approximate results.

1. Serial number decoding (SN) is the most accurate method

Serial Number (SN) is your Xiaomi’s unique identifier, which contains encrypted production date information.

• 📦 On the sticker under the battery (if the phone is collapsible)
• 📄 In documents (guarantee ticket, check)
• 🔧 In settings: Settings → About phone → General information → Serial number
• 📱 On a box (usually on a barcode sticker)

Xiaomi's SN format is usually ABCD12345678, where the first 4 characters (ABCD) encode the date.

• The first letter (A) is the year of production (e.g. 9 = 2019, K = 2020, L = 2021).
• The second and third letters (BC) are the month (01 to 12).
• The fourth letter (D) is the week of the month (a number or letter where A = 1, B = 2, etc.).

Example: SN K8M3... stands for March 2020, Week 3 (K = 2020, 08 = August, M = Week 13).

⚠️ Attention: On some models (e.g., POCO F3 or Redmi K40), the first characters SN may not encode the date but the factory code. If your SN starts with numbers (e.g., 1234...), use the method with IMEI.

2. IMEI Verification – an alternative to SN

If the serial number does not contain a date or you doubt its authenticity, use IMEI, the international mobile device identifier.

• 📱 In settings: Settings → The phone. → General information → IMEI
• 📞 typing *#06# (a window will appear with the IMEI)
• 📦 On a sticker under the battery or on the box

IMEI consist 15 the first number, where 8 — This is the model of the device and the country of manufacture, and 9-14 — serial number of the plant, date of production IMEI I don’t know directly, but I can:

1. Check IMEI on official services (for example, IMEI.info or Mi Account).
2. Compare the first 8 digits to the Xiaomi database (for example, through the IMEI-Number service).

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If the service shows a model that does not match your phone when checking IMEI (for example, POCO X3 is displayed instead of Redmi Note 11), this is a sign of flashing or forgery.

Example: IMEI 869523041234567, when tested, shows the model Xiaomi 12T (22081212G).

⚠️ Warning: Some services may not show the date of production, but the date of activation of IMEI in the database, the difference can be up to 6 months (transport and storage time in stock).

3.Date on box and stickers - visual inspection

If you have the original box, the production date can be found:

• 📅 On a barcode sticker (usually in YYYY-MM-DD or MM/YYYY format).
• 🏭 On a label with a factory address (e.g. Made in China 05/2023).
• 📦 At the bottom of the box (sometimes printed in Batch format: 202307 = July 2023).

Please note the date format:

• 2023.05.15 - the exact date of packaging.
• 2305 - May 2023.
• W25/2023 – 25th week of 2023

If the label is erased or missing, check:

• 🔍 Under the battery (on non-share models, under the back cover).
• 📄 In warranty card (the date of sale, which is usually 1-3 months after the date of manufacture).

On the box | In the phone settings | By serial number | By IMEI|I don't know where to look-->

4. Hidden menus and engineering codes

For advanced users, there is a way to find out the production date through the engineering menu, which does not work on all models, but can give accurate information about the firmware and hardware build date.

Instructions:

1. Open the Phone app and type in the code ##4636## (some models may require ##284## or #283###).
2. Go to the phone information or Hardware info tab.
3. Find the Manufacture date, Build date, or RF cal date.

Example of conclusion:

Manufacture date: 2023-05-18




Build number: SKQ1.211006.001

Here, 2023-05-18 is the firmware date, not the production date. The actual build date of the device may be 1-6 months earlier. However, if the date is fresh (for example, 2026), and the phone is purchased as a used one, this is a reason to be wary.

Make sure the phone is 50 percent charged.+|Use the original cable (on some models, the codes don't work through USB-C]|Do not change the settings in the engineering menu without knowing the consequences.|Photograph the data screen for comparison-->

⚠️ Warning: On custom firmware models (e.g. Xiaomi.EU or LineageOS), the dates in the engineering menu can be changed. In this case, trust only physical labels (SN, box).

Analysis of hardware tags (for collapsible models)

If you are ready to disassemble the phone (or it is already disassembled), the production date can be found:

• 🔋 On a battery (e.g., 2022-11-05).
• 🖥️ On the motherboard (label in W30.2023 = 30-week 2023 of the year).
• 📡 On the module Wi-Fi/Bluetooth (sometimes month and year).

Example of tags on the board Redmi Note 10 Pro:

• PCB: 2135-012345 – where 21 = 2021, 35 = 35th week.
• DATE: 2021.09.10 - exact assembly date.

For non-collectible models (for example, Xiaomi 13 or POCO F5), this method is not suitable - you will have to rely on SN or IMEI.

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If the battery and board dates differ by more than 3 months, this may indicate replacement of components (e.g. after repair).

6. Xiaomi Online Services and Databases

If manual methods do not help, use official and third-party services:

Example of check on mi.com/verify:

1. Enter SN or IMEI.
2. The system will show the date of the first activation (e.g. 2023-07-15).
3. Subtract 1-6 months is the approximate production date.

⚠️ Warning: Some services (e.g., IMEI24.com) may show incorrect data for Xiaomi because they are targeting Samsung or Apple databases. Always check with official sources.

7. Indirect indications of the age of the telephone

If none of the methods worked, estimate the age of the device by indirect signs:

• 🔋 Battery status: Go to Settings → Battery → Battery status. If capacity has dropped below 85% in 1-2 years, the phone is likely older than 2022.
• 📦 Box design: Until 2021, Xiaomi used orange boxes, and from 2022, white with minimalist design.
• 🔄 Version MIUI: The 2020-2021 phones typically do not support MIUI 14+.
• 📡 Network support: Models up to 2022 often don’t have 5G or only support SA- mode.

Critical sign of counterfeiting: if the phone claims to support features that were not available at the time of its intended release (for example, Redmi Note 9 with MIUI 15 or POCO X3 with Android 14).

FAQ: Frequent questions about Xiaomi's production date