Xiaomi Mi 9T, which year? understand the dates, firmware and versions

The Xiaomi Mi 9T (also known as the Redmi K20 in some regions) has become one of the brand’s most popular devices thanks to its combination of powerful hardware, retractable front-facing camera and affordable price. But when buying a used model or checking originality, the question often arises: what year of release is your Mi 9T? This information is critical for assessing battery status, firmware compatibility and even market value.

In this article, we will not only tell you when exactly the Mi 9T came out, but also teach you how to determine the exact date of production of your device by serial number, check the relevance of firmware and avoid counterfeits. And also understand why the year of release can affect the performance of a smartphone today, from support for updates to compatibility with accessories.

The official year of release of Xiaomi Mi 9T: the chronology of the model

Xiaomi Mi 9T It was announced on June 12, 2019, at a presentation in Spain, and global sales started in July of the same year. K20, It debuted in China a month earlier, in May 2019. 9T produced not earlier than the second half of 2019.

Production of the model continued until mid-2020, after which Xiaomi focused on the release of a successor - Mi 9T Pro (aka Redmi K20 Pro).However, in the secondary market, there are still devices with release dates until early 2021 - this is due to leftovers in warehouses and flashing regional versions.

• 📅 May 2019: Redmi release K20 in China (prototype of Mi) 9T).
• 🌍 June 12, 2019 – the global announcement of Xiaomi Mi 9T.
• 🛒 July 2019 – start of sales in Europe and other regions.
• ⏳ 2020–2021 – gradual curtailment of production, but “late” batches are possible.

It's important to understand that the date on the box and the actual year of production of the device may not coincide. For example, a smartphone could be released in December 2019, but will remain in stock until mid-2020.

How to find out the year of release of your Xiaomi Mi 9T: 3 proven ways

If you already own a Mi 9T or are planning to buy a used model, here are three reliable ways to determine its age:

By serial number (IMEI or SN)

The serial number (SN) or IMEI contains encrypted information about the date of production, to decrypt it:

1. Find the IMEI on the box, under the battery (if the back cover is removed), or in the Settings → About phone menu.
2. Use online services like IMEI.info or IMEI-Number.com.
3. In the results of the check, look for the Manufacture Date line.

Example: if the serial number starts with 9L9..., then the device is released in 2019 (number 9 at the beginning of the code).For Xiaomi, the rule is: the first digit of the SN after the letter = the last bit of the year (for example, 9 = 2019, 0 = 2020).

2. Through the phone's settings menu

In the MIUI firmware, information about the date of the first activation of the device is hidden:

1. Go to Settings → About the phone → All the characteristics.
2. Find the item Production Date or First activation date (may not appear on all firmware).
3. If you don’t have a paragraph, use the engineering menu: enter the code ##4636## in the dialer and find the Hardware info section.

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If the activation date is significantly later than the production date (e.g. 2021 when released in 2019), this could mean that the phone has been in storage for a long time or has been restored after repairs.

3. According to the firmware and hardware revision version

The Mi 9T factory firmware also contains hints about the age of the device:

• 📱 Open the Settings. → The phone. → Version. MIUI.
• 🔍 Look at the build number (for example, QKQ1.190825.002). Numbers after the point (190825) often indicate the date of firmware compilation - here 19 = 2019 year, 08 = August, 25 = number.
• 🔧 Hardware audit (e.g, V12.0.1.0.QFJMIXM) The letters M, N at the end often mean 2020).

Why the Year of Release Is Important: 5 Reasons to Pay Attention

Many used-tech buyers underestimate the value of the production date, but for the Xiaomi Mi 9T, this is a critical parameter.

1. Battery status: Even if the phone is not used, lithium-ion batteries degrade over time, and a 2019 device could lose up to 30-40% of capacity by 2026, even when it is in a pack.
2. Update support: Xiaomi officially stopped releasing updates for the Mi 9T in 2022. late batch devices (2020-2021) received security patches longer.
3. Accessory compatibility: Some cases or early-stage protective glass may not be suitable for later revisions due to design changes (e.g., misalignment of microphone holes).
4. Warranty period: if the phone was released in 2019, its warranty expired in 2021, late batches (2020) could have a valid warranty until 2022.
5. Market value: the difference in price between the Mi 9T 2019 and 2020 release in the secondary market can reach 15-20%.

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If you’re offered the new Xiaomi Mi 9T in 2026, it’s almost certainly a fake or a refurbished device – the original smartphones haven’t been released since 2020.

Table: How the year of release affects the characteristics of the Mi 9T

Note: If a seller claims that the phone is released in 2021 or later, it is a reason to doubt the authenticity of the device. Xiaomi did not produce the Mi 9T after 2020, and all the “new” copies on the market are either restored or fakes under the Xiaomi brand.

Frequent questions about the release date of the Mi 9T: debunking myths

There are a lot of misconceptions about the Mi 9T, especially about the year it was produced.

Myth 1: “If 2021 is written on the box, it means the phone is new.”

In fact, the date on the box indicates the year the package was manufactured, not the device itself. Xiaomi often uses old boxes for new batches, so you can't trust only that data. Always check the serial number!

Myth 2: “All Mi 9Ts are coming in 2019”

It's not. As we wrote earlier, production continued until mid-2020, and individual batches could be assembled later, for example, devices for some markets (like India) were produced longer.

Myth 3: “The release year doesn’t matter if the phone is in perfect condition.”

Even if the Mi 9T looks new, its battery and components age regardless of use. Lithium-ion batteries lose capacity simply with time, and rubber seals (for example, around the retractable chamber) can dry up. Therefore, the 2019 device in “perfect condition” often requires a battery replacement in 3-4 years.

Myth 4: “Late batches of Mi 9T have better iron”

Xiaomi didn’t upgrade the Mi 9T hardware during production, all of which have the same Snapdragon 730 processor, 6GB of RAM and 128GB of memory (in the base version), the only differences are firmware and build date.

Myth 5: “If your phone is updated, it’s new.”

MIUI updates are not tied to the device’s production date. Even the 2019 Mi 9T could have received updates until 2022. Now (2026) official updates for this model have been discontinued, but custom firmware (such as LineageOS) can be supported by enthusiasts.

How to avoid fraud when buying used Mi 9T: checklist

If you are planning to buy Xiaomi Mi 9T hand-held, use this algorithm to avoid running into a fake or badly worn device:

📱 Ask for a photo of the serial number (SN) and check it out via imei.info

🔋 Request a screenshot from AccuBattery with battery health data

📦 Make sure the date on the box matches the year of production (up to 6 months is allowed)

🔍 Check the retractable mechanism of the camera – it should work smoothly, without creaking

📱 Run a screen test for broken pixels (for example, through the Screen Test app)

🔋 Connect to charging – the original power supply should show Quick Charge 4+

📶 Check it out. IMEI *#06# - This must match the data in the box-->

Pay special attention to the retractable camera - this is the most vulnerable place in the Mi. 9T. The mechanism often breaks down when falling, and repairs cost 3,000–5,000. ₽. Ask the seller to shoot video of the camera (stop/clean) and listen to extraneous sounds.

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If the seller refuses to provide the serial number or battery details, that's an excuse to drop the deal.

Mi 9T: What to choose instead of an outdated model

If, after checking, it turns out that the Mi 9T is too old or worn out, consider more modern alternatives from Xiaomi with similar specs:

• 📱 POCO X5 Pro 5G (2023) — Snapdragon 778G, 120Hz screen, price from 18,000 ₽. The Best Choice for Games and Multimedia.
• 📱 Redmi Note 12 Pro+ (2023) — 200-MP camera, fast charging 120 watts, price from 22 000 ₽.
• 📱 Xiaomi 11 Lite 5G NE (2021) – Thin body, Snapdragon 778G, b/w price from 12,000 ₽.
• 📱 POCO F4 (2022 - 120 Hz AMOLED, stereo speakers, price from 15,000 ₽.

All of these models support Android 13/14 and will receive updates longer than the Mi 9T. If you are critical to the retractable camera, look for the ZTE Axon 20 5G or Oppo Find X2 Pro, but they are much more expensive.

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Buy Xiaomi Mi 9T In 2026, it makes sense only as a budget decision for 5,000–7,000 dollars. ₽. In other cases, it is better to consider newer models with current support.

FAQ: answers to popular questions about Xiaomi Mi 9T