How to put a protective glass on Xiaomi Mi 9T: a detailed guide with life hacks

Why the protective glass on the Xiaomi Mi 9T is not a luxury, but a necessity

The Xiaomi Mi 9T screen with AMOLED technology and a resolution of 2340×1080 is one of the key advantages of the smartphone, but also its most vulnerable place. Even a slight fall on asphalt or contact with keys in your pocket can turn into cracks costing a third of the price of the device. The protective glass not only prevents mechanical damage, but also reduces the wear of the oleophobic screen covering by 40-60%, which the Mi 9T wears out especially quickly due to the glossy surface.

But not all glasses are equally useful. Cheap PET films or thin 0.1 mm glass often don't save you from impact, and improper installation leads to bubbles, detachment of the edges and even a rainbow effect in bright light. In this article, a proven manual with Mi 9T features: notches under the front camera, curved edges of the screen and sensor sensitivity to glass thickness.

What kind of glass to choose for Xiaomi Mi 9T: comparison of 5 types

The market offers dozens of options, but the Mi 9T is critical to consider three parameters: thickness, coating and compatibility with the cutout. For example, glass thicker than 0.33 mm can degrade the sensitivity of the sensor, and models without an oleophobic layer quickly become greasy.

The Mi 9T is best suited for a 2.5D glass 0.26-0.3mm thick with an oleophobic coating, thin enough to keep the fingerprint scanner running smoothly (under the screen) while also reliably protecting against scratches. From proven brands: Spigen Glas.tR EZ Fit, Nillkin H+ Pro or Xiaomi Original (if you find them on sale, they are made in limited batches).

⚠️ Attention: Glass with UV-With adhesives like the Whitestone Dome, you need a lamp to install, and without that, the glue doesn't polymerize, and the glass will fall off in 1-2 days. 9T This option is excessive - enough traditional silicone glue.

Preparation of the smartphone: what to do before installation

The mistake of 80 percent of users is to try to stick glass on a dirty or wet screen. On the Mi 9T, this is especially critical because of the glossy surface that attracts dust and grease. Preparation takes 10-15 minutes, but saves hours on re-painting. Here is a checklist of mandatory steps:

Pay special attention to the front camera cutout, where dust often accumulates that is difficult to see with the naked eye, use a flashlight at a 45° angle, so the shadows will give even microparticles, if the dust remains, carefully remove it with tape (not paint! - it leaves glue).

Also check the case: if it has high sides, they can press on the edges of the glass and cause detachment. For the Mi 9T, cases with a minimum protrusion (up to 0.5 mm) or without will fit. Examples of compatible models are Xiaomi Mi 9T Clear Case, Spigen Thin Fit.

💡

If you don't have an alcohol wipe on hand, use a mixture of water and vinegar (1:1) - it is good to defat. But after it, be sure to dry the screen with a dryer in cold mode for 2-3 minutes.

Step-by-step: how to glue glass without bubbles

The installation process on the Mi 9T is nuanced by the retractable camera and curved edges of the screen. Follow the algorithm strictly in steps, so you minimize the risk of errors:

1. Unpack the glass and check the kit: the glass itself, wipes (dry + wet), dust collector, positioning sticker. If there is something missing, return the goods to the seller.
2. Put the positioner (if any) on the screen, it will help to accurately align the glass. For the Mi 9T, it is critical to combine the cutout under the camera - even a 1 mm shift will spoil the appearance.
3. Remove the protective film from the glass on only one side (the one that will stick) and do not touch the outer film, which protects from scratch until it is fully installed.
4. Carefully apply the glass to the screen, starting from the top (on the speaker side). Use the positioner or visually control the matching of cutouts. Don't press, the glass must stick itself under the influence of electrostatics.
5. Remove the bubbles with a plastic scraper (it comes with) or a bank card. Move from center to edge. If the bubble doesn't disappear, lift up the glass and reglue (you have 1-2 attempts until the glue dries).
6. Check the sensitivity of the screen. Run Settings → System → Gestures and test swipes. If the glass is thicker than 0.3 mm, calibration may be required (more on this below).

On the Mi 9T, there is often a problem with detachment of the edges due to the curved screen. To avoid this, after installing the edges with a dryer (at minimum power!) for 10-15 seconds, this will activate the glue. Alternatively, put the smartphone under a heavy book for 1-2 hours.

Calibration of the sensor after installation of the glass

If the glass is thicker than 0.3 mm after sticking, the Mi 9T sensor may be less responsive to touch, which is because the Synaptics screen controller in this model is sensitive to changes in the distance between the finger and the matrix.

1. Go to Settings → System → Additional → Screen calibration (if there is no item, use the method below).
2. Enter the engineering code: ##6484## Select Touch Screen Test → Calibration.
3. Follow the instructions on the screen: tap the points that appear with a stylus (not a finger!). That's more accurate.
4. After calibration, restart the smartphone.

If calibration does not help, check the pressure on the sensor in the test mode:

##4636##

So you pick Touch Test and see how all the areas on the screen react, and red crosses are a sign of poor sensitivity, and you'll have to take the glass off and replace it with a thinner one.

⚠️ Note: Do not install updates after calibration MIUI within 24 hours, in some versions of the firmware (e.g, MIUI 12.5.3) factory reset resets and sensor calibration.

Top.-5 Mistakes in the labeling and how to avoid them

Even experienced users make mistakes that ruin the results, and here are the most common mistakes and ways to prevent them:

• 🔍 Dust under glass. Reason: not enough screen cleaning or a sticker in a dusty room. Solution: Use a sticky roller to remove microparticles (sold in electronics stores).
• 💧 Bubble around the edges. Cause: uneven distribution of glue or pressure on glass. Solution: after sticking, warm the edges with a hair dryer (temperature no higher than 40).°C).
• 📱 Poor sensitivity. Cause: glass too thick (>Solution: replace the model with 0.26-0.3 mm or calibrate.
• 🔄 The glass leaves after a day, and the reason is cheap glue or moisture under the glass. Solution: buy silicone-glued glass, like Nillkin Super Frosted).
• 🎨 Rainbow divorces. Cause: low-quality coating or installation at an angle to light. Solution: glue the glass in bright light (for example, under a lamp).

The Mi 9T features a retractable camera that can interfere with the sticker, so if the glass doesn't fall flat because of the protruding camera, press it slightly (it will sink in) and then fix the glass, and once installed, the camera will move back out without any problems.

💡

The most common mistake is ignoring the temperature regime. The glue on the glass for the Mi 9T works optimally at 20-25 ° C. In cold it thickens, in heat it is too liquid. If the room is cool, warm up the glass in your hands for 1-2 minutes before the sticker.

How to extend the life of protective glass: care and replacement

The average glass life on the Mi 9T is 6-12 months, but with proper care, it can be extended to 18 months.

• 🧼 Cleaning: use special wipes for screens (no alcohol!) or microfiber. Regular wet wipes destroy the oleophobic coating.
• 🚫 Avoid contact with keys, coins, sand, even small particles of sand leave micro-scratch when rubbed.
• 🔋 Charging: Do not put the smartphone screen down on hard surfaces while charging – vibration from notifications accelerates wear of the edges of the glass.
• 🔄 Replacement: If you have deep scratches (visible when you turn off the screen) or the glass cracks, change it immediately.

The Mi 9T has a problem of losing the oleophobic glass coating after 3-4 months, and can be repaired using a nanocoating (like Liquid Glass Screen Protector), applied to a clean glass and rubbed with microfiber, which will return the slip of the finger and protection from greasy marks.

If the glass starts to move away at the edges, don't be too quick to change it.

1. Carefully lift the detached edge.


2. Drop a superglue gel under it (literally 1 drop!).




3. Press the glass and heat up with a hair dryer for 20 seconds.

This method works if the detachment is less than 20% of the area.

FAQ: Answers to Frequent Questions