How to accurately determine the year of release of the Xiaomi phone: all ways

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

Even a new-looking Xiaomi smartphone can be in stock for years, with the year of release having a direct impact on the relevance of iron, battery life and support for upgrades, such as the Redmi Note 10, released in 2021, will no longer have fresh MIUI firmware by 2026, and its battery will lose up to 20% of capacity.

Marketplace vendors often hide the real age of the device by giving the model’s year of announcement instead of the date of production of the particular instance. This misleads customers: Xiaomi 12T, announced in 2022, could be assembled in 2023 – the difference in the condition of the components will be significant. In this article, we will examine all legal methods of verification, including hidden system data that can not be forged.

Method 1: Decoding of the serial number (SN)

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

📅 2015–2018 year: format ABC12345678, where 4-me 5-I'm numbers, week, 6-I'm a year, for example, 518 = 51-I'm a week. 2018 year-end).
🔢 2019–2022 year: format 123ABCD4567, where ABCD — week and year code (example: K208 = 20-I'm a week. 2021 year-end).
🆕 2023–2026 year: format Z12ABCD3456, where AB — year, 23 = 2023), CD — week-long.

To find SN, go to Settings → About Phone → General Information → Serial Number. Or type ##4636## in the phone keyboard and select Device Information.

💡

If the serial number starts with MP or ZP, the device is assembled in a factory in India, and these models often have a different date format in the SN — check the transcript below.

SN prefix	Year of release	Example of SN	Transcription
No prefix.	2015–2017	3C65G1234567	Week 5 of 2016
MP/ZP	2018–2020	MP9H7K123456	Week 7 of 2019 (India)
Z12	2021–2022	Z12K208A1234	20th Week 2021
Z13	2023	Z132315X7890	Week 15, 2023

⚠️ Warning: On fake devices, the serial number can be generated by accident.Verify its authenticity on the official Mi Verify website.

Method 2: Checking the box and stickers

Xiaomi's original packaging contains a few date tags, but not all of them indicate the year of production of a particular phone.

Barcoded sticker: The MFG Date or Date of Manufacture bar indicates the date in YYYY-MM-DD format.
Certification sticker (usually at the bottom of the box): Look for S/N or IMEI codes with a nearby date.
Print on screen film: on some models (for example, Poco F3), a date in WWYY format (week/year) is marked under the protective film.

Note that the date on the box may indicate packing time, not the phone assembly time, and the difference is usually 1-2 months, but check it against the serial number for accuracy.

How to distinguish a repackaged phone?

If the box looks new but the serial number on it doesn't match the SN in the phone's settings, the device could be opened, and check: no factory film on the screen, traces of glue on the box lid, IMEI mismatch on the sticker and in the system (enter *#06#).

📊 Where you usually check the date of production of the smartphone?

By serial number.

In the box

In system settings

Not checking.

Another way.

Xiaomi's hidden menus contain firmware and component calibration data that indirectly indicate the age of the device.

Open the Phone app and type ##4636##.
Select Device Information.
Scroll to the Opening Time block – the date of the first activation may be displayed here.

For models on Qualcomm (most Redmi and Poco):

adb shell getprop ro.boot.ddr_size


adb shell getprop ro.boot.date

The second command will return the date in WWYY format (e.g. 1522 = Week 15 of 2022).

Enter the code ##4636##

Find the item "Device Information"

Compare the date to the serial number

Check the compliance of the model and firmware-->

⚠️ Note: On custom firmware phones (like LineageOS), system dates can be reset (SN, box).

Method 4: Online Services for IMEI Verification

The international IMEI is linked to the date of manufacture of the device, to know the year:

Find IMEI in Settings → About Phone → General information or enter *#06#.
Go to one of the services: 🌍 IMEI.info (Paid Extended Verification) 🔍 ImeiPro (free for basic information) 📱 Numerei (supported by Xiaomi)

Manufacture Date

Important: Services show the date of registration of IMEI in the database, which may differ from the actual build by 1-3 months.

Service	Accuracy of date	Cost	Xiaomi support
IMEI.info	±2 weeks	Free/Paid Report	Yes.
ImeiPro	±1 month	Free of charge.	Partially.
Numerei	±3 weeks	Free of charge.	Yes.

Method 5: Analysis of battery status

Xiaomi battery loses capacity even when it is turned off: 2 years of storage without use degradation reaches 10-15%.

Install the AccuBattery (Play Market) app.
Charge your phone to 100% and wait for the calibration (1-2 cycles).
Check the field Wear assessment: 🔋 0-5%: The phone was released less than 6 months ago. 🔋 5–15%: Age 6–18 months. 🔋 15–30%: 1.5–3 years. 🔋 30%+: device more than 3 years.

Also, look at the battery production date in the settings: Settings → Battery → Battery Status → Manufacturing Date (not available on all models). For example, on Xiaomi 11T Pro, this information is displayed in YYYY-MM format.

💡

If the battery wear exceeds 20% at the age of the phone "1 year", it is either actively operated or stored in imperfect conditions (temperature above 30 ° C).

What to do if the dates do not match

The difference between the serial number, the box and the system data up to 2 months is normal, but if the discrepancies are greater, there are three possible scenarios:

Repackaging: the phone was opened to repair or replace components: 🛠️ The presence of traces of opening on the body (scratches on screws, uneven gaps). 🔧 Correspondence of screws (on Xiaomi use screws with a cross-shaped slime) PH00).

Fake.

*#06#

Manufacturer's error

If you bought a phone with discrepancies in dates, contact the Xiaomi service center with a check - they will specify the real year of release by the serial number. In Russia, official centers are in Moscow, St. Petersburg, Yekaterinburg and Novosibirsk.

FAQ: Frequent questions about Xiaomi release date

📅 Can you determine the year of release from the phone model?

No, the model only indicates the line and year of the announcement, not the production of a particular device. For example, the Redmi Note 11 was announced in 2022, but released until mid-2023. Always check the serial number or box.

🔄 What to do if the serial number is erased or not read?

Use alternative methods: Check IMEI with *#06# and use online services. Check the box for stickers with the date of MFG Date. Connect your phone to your PC and use the Mi Flash Tool to read hidden data (developer rights required).

🛒 How to return the phone if the seller hid the real year of release?

In Russia, this is regulated by the law "On Protection of Consumer Rights" (Article 10 - the right to information). To return: Take screenshots of the serial number and dates from the settings. Write a claim to the seller demanding to return the money or exchange the goods. If you refuse - contact Rospotrebnadzor or the court. The return period is 14 days from the date of purchase (Article 25 of the ZoZPP).

🔧 Does the year of release affect the possibility of repair under warranty?

The warranty period (usually 12 months) is calculated from the date of sale, not production. However: If the phone was in stock for more than a year before purchase, the warranty can be reduced (check with the seller). For Xiaomi service centers, the date of production is important - they can refuse repairs if the model is removed from support (for example, Redmi 9 after 2026).

📱 How to check the year of release on Poco phones?

Poco is a sub-brand of Xiaomi, so all methods are identical. Features: Poco serial numbers often start with POCO or MPO. In the engineering menu, the date can be displayed in the Hardware Info section. The Poco F and Poco X models have an additional battery sticker with a date in YYWW format.