How to know exactly the release date of the Xiaomi Redmi phone: from the serial number to the hidden menu

Have you bought a used Xiaomi Redmi and questioned the seller's integrity? Or do you want to see if you've been sold a repainted model under the guise of a new one? The release date of your smartphone is a key parameter that affects warranty life, battery life, and even the market value of the device. Unfortunately, manufacturers rarely list it directly on the box or in the settings, but there are at least 5 ways to determine it, from simple to technically complex.

In this article, we will look at all the current methods, from decrypting the serial number to analyzing hidden system data through the engineering menu, you will learn how production dates differ for different regions (China, global version, India), why some Redmi Note 10 and newer models can be encrypted differently, and how to avoid counterfeiting when buying. All instructions are illustrated with screenshots and adapted for users without technical skills.

1. Verification of the serial number release date (IMEI/SN)

The fastest way is to extract the date from the serial number (SN) or IMEI. Xiaomi has it encoded in the first 4-6 characters, but the encryption algorithm has changed over the years, for example, for models up to 2020 used the YYWW (year and week), and for new ones – YWW or even YM (year and month).

Where to find SN or IMEI:

• 📦 On the sticker under the battery (if the body is removable) or on the tray SIM-map.
• 📱 In settings: Settings → The phone. → General information.
• 📞 Type *#06# - will be displayed IMEI.
• 📦 On the device box (usually under a barcode).

How to decipher:

1. Take the first 4 SN characters (e.g. 2018 or 9123).
2. For older models (Redmi 4/5/Note 5): The first 2 digits are a year (e.g. 18 = 2018). The next 2 digits are a week (e.g. 35 = 35 weeks of the year).

Redmi Note 11/12, POCO X4

• The first digit is a year (e.g. 9 = 2019, 0 = 2020).
• The next 2-3 digits are a month and a day or a week.

⚠️ Note: Fake Xiaomi serial numbers are often forged. SN The box and the settings of the phone do not match – this is a reason to check through official services (see section 4).

2.Date analysis on the box and device stickers

If you still have the original box, it should have a sticker with the date of production or logistics information.

• 📅 Date of Manufacture (direct date indication in format) MM-YYYY or YYYY/MM/DD).
• 📦 Lot Number or Batch Code – may contain an encrypted date (similar to the same). SN).
• 🏭 Made in China/India — country of production (important for guarantee).

Examples of boxes from different years:

If there is no explicit date on the box, look for the barcode: the first digits after the country of origin (e.g. 690... for China) may contain a coded year. Use online services like UPC Database to decrypt it.

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Take a picture of the sticker on the box before you buy a used phone, which will help you compare the date to the serial number in the settings and identify a fake.

3. Check through the engineering menu (for advanced users)

Xiaomi’s engineering menu contains detailed hardware information, including the motherboard and firmware assembly date, which is more accurate than the serial number, but requires caution – wrong actions can cause the system to crash.

How to open the engineering menu:

1. Open the Phone app.
2. Enter the code ##4636## (for new models, it may not work).
3. Alternative code: ##284## (Equipment Test)
4. Go to the Hardware Information or Device Information tab.

Look for the lines:

• Manufacture Date is the date of production of the board.
• Build Time – firmware build date (may differ from device date).
• RF Calibration Date - Calibration date of the radio module (close to the release date).

⚠️ Note: On some models (Redmi Note 10 Pro, POCO F3) Attempting to enter codes more than 3 times can lead to a temporary lock of the keyboard.

4. Official verification through Xiaomi services

If you doubt the authenticity of the device, the most reliable way to verify it is through official Xiaomi databases.

1. IMEI check on Mi Verify. Enter IMEI (can be found by *#06#) The system will show the model, activation date and warranty status. If the device is not found, it is a fake or a grey import.

Mi Account

• Register your device in your Xiaomi account.
• Go to the Devices. → Details.
• The Warranty Information section will indicate the date of the start of the warranty period (usually the same as the date of sale).

An alternative method is to analyze the /proc/cpuinfo file:

adb shell cat /proc/cpuinfo | grep "Serial"

The first digits in the answer may contain the chipset’s production date (e.g., CPU implementer: 0x41, Serial: 0x20081234 → 20 = 2020).

⚠️ Note: On phones with custom firmware (like LineageOS) or after resetting to factory settings, the log date can be reset.

Indirect signs: battery, equipment, packaging

If none of the above methods worked, pay attention to indirect signs that will help estimate the age of the device:

• 🔋 Battery status: Go to Settings → Battery → Battery status: If the capacity has dropped below 85% of its nominal capacity, the phone is likely to be older than 1-2 years.
• 📦 Beginning in 2021, Xiaomi stopped putting chargers in the box (with the exception of flagship models.
• 🏷️ Stickers and holograms: On new models (Redmi Note 12, POCO X5) The hologram on the box has 3D-effect, and on the old, flat.
• 🔌 Type of connector: Models up to 2020 often had a Micro-USB, while all Redmis from 2021 are equipped with a micro-USB USB-C.

Also, pay attention to the design of the box:

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If the phone is being sold as a "new" phone, but it comes with a Micro-USB charger, and the orange box is a clear sign of cheating, it's probably released before 2020 and it's not warranty anymore.

FAQ: Frequent questions about the release date of Xiaomi Redmi