How to find out the release date of the smartphone Xiaomi Redmi Note 4: 5 proven ways

Xiaomi Redmi Note 4 is still popular with users, despite the release of newer models. One of the key issues when buying a used device or assessing its condition is the release date. It affects not only the actual age of the gadget, but also the potential wear of the battery, the duration of support for updates, and market value.

In this article, we’ll look at all the current ways to determine the production date of the Redmi Note 4, from IMEI to factory labeling analysis, which methods give 100% accurate results and where errors are possible, and explain why the date on the box and in the phone settings may not match, and what to do about it.

Why it is important to know the release date of the Redmi Note 4

Many consumers of used equipment mistakenly believe that the appearance and performance of the device are the main thing, but the date of production directly affects:

• 🔋 Battery state - Lithium-ion batteries degrade even without active use. 2017 year-end 2026-Mu may lose up to 30-40% capacity.
• 🔄 Updates support – Xiaomi has officially stopped releasing firmware for Redmi Note 4 in 2020, but unofficial patches may depend on the age of the device.
• 💰 Market Price – The Difference Between Devices 2016 and 2018 The year of release, other things being equal, may reach 20-30%.
• 🛠️ Warranty status – even if the warranty has expired long ago, some service centers take into account the release date when diagnosing.

Also, knowing the exact date will help avoid fraud, such as unscrupulous sellers may pass off repackaged devices (with replaced components) as new ones, masking real age.

Method 1: IMEI Testing is the most accurate method

The International Mobile Equipment Identifier (IMEI) is a unique 15-digit code that is assigned to each device during the manufacturing phase, which not only provides the release date, but also checks the phone’s originality, repair history (if recorded in the database), and even the country of manufacture.

To find out the IMEI of your Redmi Note 4, do one of the following:

• 📱 Type *#06# on the phone keyboard – the code will automatically display.
• 📦 Look at the sticker under the battery (if the phone is collapsible) or on the box.
• ⚙️ Go to Settings. → The phone. → General information → IMEI.

Then use one of the services to decrypt IMEI:

⚠️ Attention: If during the inspection IMEI The service shows a date that is very different from the one on the box (more 1-2 months, this may mean that the phone has been repackaged or recovered, in which case we recommend additionally checking the device through Settings. → The phone. → Version. MIUI — If there is a firmware older than the date on the box, it is a warning sign.

Check the IMEI on the box and phone to match |Contrast the production date with the first turn-on date in the settings |Contrast the repair history (if available) |Contrast the manufacturer country to the purchase region-->

Method 2: Date on the box and stickers - where to look

Xiaomi's maker puts the release date on the package and some of the device's elements, but not always in the obvious places. On the Redmi Note 4 box, look for:

• 📦 Barcode with numbers – usually the date is encoded in the first 4-6 symbols after the letter prefix (for example, 201703 signifies 2017 year-end).
• 🏭 Serial number sticker – may contain a line of type MFG Date: YYYY-MM-DD or similar.
• 🔖 Hologram - in some batches, the date is marked in small print next to the protective hologram.

On the phone, the date can be indicated:

• 🔋 Under the battery (if the model is collapsible) - on a white sticker with IMEI serial number.
• 📱 Nana SIM-less common, but some parties have an engraving with a month and a year.

Note that the date on the box and the date of production of the device may vary by 1-3 months, which is normal, since phones are often in warehouses before packaging, but if the difference is more than 6 months, this is a reason to doubt the authenticity of the package.

Method 3: Analysis of firmware and MIUI versions

You can find the date of the first turn on of the phone through system settings, but this method does not work on all firmware. For Redmi Note 4, follow the following steps:

1. Open the Settings. → The phone.
2. Find the Hours or Status (the name may vary depending on the version of MIUI).
3. Scroll down to the Date of First Including or First Boot Time section.

If this item is missing, try an alternative method:

1. Install the CPU-Z app from Google Play.
2. Go to the About (About Program) tab.
3. Find the Device Manufacture Date or Build Time line.

⚠️ Note: The firmware date may be reset after a full hard reset or flash. If you see a date later than 2020 (when Redmi Note 4 support officially ended), chances are the phone has been reflashed or restored.

Also, please note the MIUI version:

• 📅 If it's older, MIUI 11. for example, MIUI 9), the device is definitely not new – these versions were released before 2019.
• 🔄 The presence of custom firmware (for example, LineageOS or Pixel Experience) indicates that the phone is actively used and modified.

Method 4: Serial number (S/N) check

The serial number (S/N) is another unique identifier that can be used to determine the release date. Unlike IMEI, it more often contains encrypted information about the production batch. On the Redmi Note 4, you can find the serial number:

• In settings: Settings → About phone → General information → Serial number.
• On the box, next to the barcode.
• Under the battery, on a white sticker.

The Xiaomi serial number is usually in the format of ABC12345678, where:

• ABC is the model code (for Redmi Note 4, it can be MDG, MZD or the like).
• 1 is the last digit of the year (e.g. 6 = 2016, 7 = 2017).
• 23 is the week of production.

An example of decryption:

• Serial number: MZD735123456
• Transcript: 7 (2017) + 35 (35th week) → August 2017.

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If the serial number starts with 8H or 83H, it may indicate a device assembled for the Indian market (a Redmi Note 4X modification), in which case the date is decrypted according to the same rules, but taking into account local batches.

Method 5: Physical examination – what gives the age of the phone

Even without access to the settings or box, you can roughly determine the age of the Redmi Note 4 by external signs.

• 🔋 Battery: If the phone holds a charge less than 4-5 At average load, the battery is likely to be older. 2-3 A bloated battery (seen by the rear cover or screen) indicates age. 3+ year-end.
• 📱 Body and screen: Yellowed keys or screen frame - a sign of prolonged exposure to ultraviolet (2).+ year of use. Deleted inscriptions on SIM-tray or buttons - the device is actively used.
• 🔌 Charging port: A loose microUSB connector or traces of oxidation inside indicate long-term use. If the cable is held only at a certain angle, the contacts are worn out (typical for devices older than 2018).

Critical sign: if the back of the phone has the inscription Made in India, and the serial number begins with 8H, This is a Redmi Note. 4X These devices often had problems with the quality of the batteries already through the 1.5-2 year-end.

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Physical wear is an indirect but reliable indicator of age, even if the date on the box is "fresh," worn buttons or a bloated battery will give you a real life.

Frequent Mistakes and Myths About Redmi Note 4 Release Date

When determining the production date of Xiaomi Redmi Note 4 users often encounter unreliable information.

• ❌ "Date on the box = The phone’s ‘production date’ is actually the date of packaging, which can vary by several months.
• ❌ "IMEI date" — IMEI It gives you the date of registration of the code in the database, not the device assembly. 1-2 months.
• ❌ "Serial number universal for all Xiaomi – format S/N It's different for different models and different regions, like the Indian Redmi Note. 4X have a different encryption algorithm.
• ❌ "The firmware always shows the real age" - after resetting or flashing the date of the first inclusion is reset.

Another common mistake is trusting online serial number date calculators, many of which use outdated algorithms and can show the wrong year for the Redmi Note 4. For example, a calculator designed for the Redmi Note 3 will give an incorrect result for a newer model.

To avoid errors, always cross data from multiple sources:

1. Check the date by IMEI and serial number.
2. Check the date match on the box and in the settings.
3. Evaluate the physical condition of the device.

FAQ: Answers to popular questions