How to know exactly the release date of the Xiaomi smartphone: step-by-step instructions

Have you bought a used Xiaomi and questioned the seller's integrity? Or want to check if you've been sold a "repainted" new model under the guise of a fresh release? The date of production of a smartphone is a critical parameter that affects warranty life, battery status and even the market value of the device. Unlike an iPhone or Samsung, where the date is easy to find in the settings, Xiaomi often has this information hidden.

In this article, we will discuss 5 working ways to determine the year of release, from analyzing the serial number to checking through the engineering menu, you will learn what data can be trusted 100% and where sellers most often forge information, and we will also reveal the secret method of checking by IMEI, which works even for models without the original packaging.

Why it is important to know the release date of the Xiaomi smartphone

Many consumers of used equipment mistakenly believe that the appearance and performance of the gadget is the main thing.

• 🔋 Battery Capacity: Even an unused lithium-ion battery loses up to 20% of its capacity in 2 years of storage.
• ⚙️ The official warranty of Xiaomi in Russia and CIS is 12 months from the date of production, not purchase.
• 💰 Resale price: the difference between the smartphone 2022 and 2023 release can reach 30% with the same condition.
• 🔄 Updates support: Xiaomi stops issuing firmware for older models 3-4 years.

For example, if you are selling Redmi Note 11 Pro “as new, lay in stock”, but the release date is 2021, this means that the battery has already passed at least 2 cycles of degradation, even if the phone was not turned on, and the warranty for it expired in 2022.

⚠️ Warning: Sellers often fake the date in the phone settings by changing system time.Never trust the setting Date of first inclusion in the About Phone menu - it is easy to reset via Settings → System system → Additionally. → Resetting settings.

Method 1: Serial number (S/N) testing is the most reliable method

The serial number (Serial Number, S/N) is a unique device identifier assigned at the factory, encoded with information about the place of production, lot and assembly date. Xiaomi's serial number consists of 11-14 characters and usually has the format:

ABCD1234EFGH

Where:

• ABCD – the code of the model and the plant;
• 1234: week and year of production (e.g. 2235 = 35th week of 2022)
• EFGH is the individual number of the device in the batch.

To find the serial number:

1. Open Settings → About the phone → General information.
2. Scroll down to Serial Number (or Serial Number).
3. Copy or record the combination.

Find a 4-digit numerical group in the middle of S/N (e.g., 2235)

The first 2 digits are a year (22 = 2022)

Last 2 digits – week (35 = end of August)

Check the calendar of weeks by ISO (Week 1 starts on Monday)-->

An example of decryption:

⚠️ Note: On some models (e.g, POCO F3 Xiaomi 12T) The serial number may not contain dates, in which case use the method of checking by IMEI.

Method 2: IMEI check – works without a box

IMEI (International Mobile Equipment Identity is a 15-digit code that is unique to each phone. Unlike the serial number, it cannot be forged software (only by soldering the chip). IMEI:

• Dial on the phone keyboard *#06# - a window with 1-2 codes will appear.
• Or look at the settings → About the phone → General information → IMEI.

Check the IMEI through the official services:

1. Xiaomi official website: Go to the checkout page. Enter IMEI and CAPTCHA. The system will show the model, activation date and warranty status.

Important: If the date on Xiaomi and IMEI.info is not the same, trust the official source. Some services mistakenly show the date of the first activation instead of the date of production.

Yeah, always.

No, I didn't know about that.

I tried, but I didn't figure it out.

I trust the salesman at his word.-->

Method 3: Date on the box and stickers - where to look

If you still have the original packaging, the release date can be found in three places:

1. Box sticker: Look for a white barcode sticker (usually on the end or bottom of the box). The MFD (Manufacture Date) bar shows the date in YYYY-MM-DD or MM/YYYY.
2. Serial number on the box: Coincides with the S/N in the phone (see Method 1). If the numbers are different, you have a non-original box.
3. Under-battery sticker (for collapsible models): Plug off the back cover (if it is removable) and there will be a Week/Year date sticker on or under the battery (e.g. 35/2022).

Example of the sticker on the box Xiaomi Redmi Note 10 Pro:

Model: M2101K6G




S/N: ABCD2145EFGH




MFD: 2021.11

⚠️ Warning: Fraudsters often forge stickers on boxes. Check the serial number on the box and on the phone! S/N begin 000 or contains repeating symbols (e.g, AAAA1234BBBB) — it's a fake.

💡

If the sticker on the box is erased, try to light it with a flashlight at an angle - UV ink often appears.

Method 4: Hidden menus and engineering codes

Xiaomi smartphones have hidden menus where you can find the firmware build date and hardware information, which indirectly indicates the age of the device.

Instructions for models on MIUI:

1. Open the Phone app.
2. Dial the code: ##4636##
3. Go to the tab Information about the phone.
4. Scroll to the item Build Date.

Date format: MM-DD-YYYY or YYYYMMDD. For example, 03-15-2023 signifier 15 March 2023 year-end.

For Android One models (such as Xiaomi Mi A3), use the code:

##284##

In the menu that appears, select Version info → Build date.

Method limitation: The firmware assembly date may not coincide with the phone's production date (e.g., if the device was in stock or updated).

Method 5: Verification through firmware and MIUI version

The MIUI version and the Build Number also contain the device's age hints to find them:

1. Go to Settings → About Phone → MIUI version.
2. Slip a few times on the Kernel Version line to open up more information.
3. Search for lines: ro.build.date.utc – firmware compilation date; ro.boot.ddr_info — Sometimes contains a date of memory testing.

An example of decryption:

ro.build.date.utc=1675238400

Convert timestamp to date with a converter: 1675238400 = January 31, 2023.

⚠️ Note: If the phone has been updated to a new version MIUI, The firmware assembly date will be later than the actual production date, and this method only works for factory-made phones.

💡

The most reliable way is a combination of serial number + check-up IMEI. If the data match, you can be sure of the date at 99%.

Frequent Mistakes and How to Avoid Them

When checking the release date of Xiaomi, users often encounter traps:

• 🔄 Serial number: Scammers reflash the phone, changing the phone S/N Always check the number on the box, on the phone and through the phone. IMEI.
• 📅 Weeks error: Week 01 is the first week of the year (early January) not the 1st month.Use the calendar of weeks for a precise anchor.
• 📱 Clones and fakes: On fake Xiaomi (e.g. Redmi) 6A From no-name brands, serial numbers often begin with 0000 or contain the letters Z, O, I (not in the original) S/N).
• 🔋 Re-adhesive stickers: The battery sticker should be under the film. If it's on top, it's fake.

If you doubt the authenticity of the device, do the following:

Check the serial number on the official Xiaomi website

Compare the IMEI on the box and on the phone

Make sure the date in the S/N matches the MFD on the box.

Check for holograms on the package (for new devices)-->

FAQ: Answers to Frequent Questions