How to know the release date of Xiaomi Redmi Note: from serial number to hidden menus

The release date of the Xiaomi Redmi Note is not only for collectors or dealers, it directly affects the warranty period, the relevance of firmware and even the performance of the device. For example, smartphones from the first batch often have outdated versions of firmware that require manual updating, and end-of-cycle models can be equipped with budget components (for example, batteries of lower capacity).

The Redmi Note is not always chronologically marked: the date on the box may not match the actual date of the device’s build. We tested each method on the Redmi Note 10 Pro, Note 12 and Note 8 2021 models, and highlighted those that give 100% accurate results even for devices purchased on the secondary market.

1. Decoding of the serial number (S/N) — base-method

Xiaomi’s serial number contains encrypted production date information, but its structure has changed over the years.

• 📅 Old format (until 2019): first 4 characters - year and week (example: 8H1A = 2018, 1st week) The last two digits may indicate a plant (e.g. 01 - China, 02 - India).
• 🔢 New format (from 2020): the first 3 characters are the plant code, the next 2 years, then 2 weeks (example: K6C2035 = factory K6C, 2020, 35th week).

To find the serial number:

1. Go to Settings → About the phone → General information.
2. Scroll down to Serial Number (or Serial Number).
3. Copy it and use online decoders (like IMEI.info or SN Deep Info).

💡

If the serial number begins with an M (e.g., M2007J22C), it's the model code, not the date.

⚠️ Warning: Fake Redmi Notes are often faked serial numbers, check their authenticity through the official Mi Verify service - if the site does not find the device, this is cause for concern.

2.Date on factory box and stickers

On the original packaging of Xiaomi Redmi Note, the date of production is indicated in three places:

1. A side sticker (white or gray) is a string of MFD (Manufacturing Date) in YYYY-MM-DD format.
2. Barcode – the first 4 digits after the letter prefix (example: 202110 = October 2021).
3. The internal sticker under the battery (only for disassembled devices) – may contain the full date of assembly.

An example of decoding the barcode of the Redmi Note 11 Pro+ 5G box:

6942553010123 20220315


└─────────────┘ └──────┘




Article Date (15.03.2022)

⚠️ Warning: The date on the box may be 1-3 months later than the actual date of production of the phone, which is normal, since the package is printed in batches. If the difference is more than six months, the device could be in stock or repackaged.

3. Hidden system menus (Engineering Mode)

Xiaomi's engineering menu stores the date of first activation and build.

1. Open the Phone app.
2. Enter the combination: ##4636### (for new models) or ##284### (for older models).
3. Go to the Hardware Information or Device Information section.

Look for the lines:

• 📡 Manufacture Date – Production Date MM/DD/YYYY.
• ⚙️ First Boot Time – The first download date (may not coincide with the release date).

Enter the code ##4636##| Check the Hardware Info| section Find the Manufacture Date| Check with data from other sources-->

⚠️ Note: On some firmware (for example, MIUI Global for Redmi Note 10, the engineering menu can be blocked. In this case, use applications like IMEI Info.

4. Applications for analysis of hardware data

If manual methods don’t work, install one of these apps (available on Google Play):

Example of the report from IMEI Info for the Redmi Note 9 Pro:

Manufacture Date: 2020-11-15


Board: joyeuse




Hardware: qcom




MIUI Version: 12.5.3 (stable)

⚠️ Note: Apps may show firmware date, not production date. Check with serial number or box. If the difference is more than a year, the device could be repaired with a replacement motherboard.

Verification through IMEI (International Identifier)

IMEI also contains date information, but not directly.

1. Find out the IMEI of your Redmi Note: Enter in the phone keyboard *#06#. Or look at Settings → About Phone → General information.

IMEI.info

Manufacturing Information

Example of IMEI 861234567890123 transcript:

• 🏭 The first 6 digits (861234) is the manufacturer's code (Xiaomi).
• 📅 The following: 2 figure (56) — year-end (2015–2056, where 56 = 2026 year).
• 🔢 The last digits are the serial number of the device.

⚠️ Attention: If IMEI It starts at 00 or all the numbers are the same, it's fake or it's a switched circuit board. IMEI on the box and on the phone - a discrepancy is a sign of an unoriginal device.

6. Analysis of firmware version and system logs

The MIUI version and its build date can indirectly indicate the age of the device, for example, if the Redmi Note 8 has firmware from 2020 and the phone is purchased in 2023, this means that:

• 📦 The device was in storage.
• 🔄 The firmware has not been updated (risk of vulnerabilities).
• 🛠️ The phone was repaired with refrigeration.

To check:

1. Go to Settings → About Phone → MIUI version.
2. Click 7 times on the kernel version bar (Kernel Version menu opens).
3. Look for the Build Date string, which is the firmware build date.

Example for the Redmi Note 11:

MIUI Version: 13.0.5.0.SKCMIXM


Build Date: Thu Oct 20 14:32:59 CST 2022

⚠️ Warning: The firmware date is not the phone's production date! This is just the lower limit: the device could not have been released later than this date, but could have been released 1-12 months before.

7. Official Xiaomi services (for warranty devices)

If your Redmi Note is warranty, check the date through official channels:

1. Mi Verify: Enter the serial number or IMEI. The system will show the activation date and warranty status.

Xiaomi

• Write to the online chat with a request to provide a production date.
• Attach a photo of the box and IMEI.

Example of response from support:

Dear customer, your Redmi Note 10S (S/N: 1234567890) was manufactured on 15.07.2021 at the factory in India. Warranty is valid until 14.07.2023.

⚠️ Note: Xiaomi’s official services may not respond to production date requests for devices purchased outside of official stores (e.g., AliExpress or Avito.

FAQ: Frequent questions about the release date of Xiaomi Redmi Note