Xiaomi Redmi Note 9 Pro is one of the most popular smartphones of the mid-range, but its back cover made of glass or glossy plastic (depending on the modification) often suffers from scratches, chips or cracks after falls. If your device lost its presentable appearance or the lid began to move away from the case, do not rush to the service center: you can replace it yourself, saving up to 70% of the cost of repair.
In this article, you will find step-by-step instructions with a photo, a list of necessary tools, tips for choosing a quality part and unique nuances of gluing the lid on the Redmi Note 9 Pro, which are not mentioned in the standard manuals. We will also analyze the typical errors that can quickly fall off or damage the internal components of a smartphone.
Training: tools and materials
Before you start disassembling, make sure you have everything you need.To replace the back cover with the Redmi Note 9 Pro, you will need a specialized toolkit, as standard screwdrivers or knives can damage fragile latches of the case.
Here's the full list:
- 🔧 Plastic spatula (preferably a set of 2-3 pieces of different thicknesses) - for careful putting of the cover.
- 🔨 Thermophen or hair dryer (power at least 1500 W) - for softening glue.
- 🧲 Suction cups (2 pieces, in diameter 3-5 (c) - will help to evenly lift the cover.
- 🔗 Double-sided tape or glue B-7000 — to fix a new lid (original Xiaomi glue is difficult to find).
- 📱 New back cover – only the original or certified counterpart (more on this below).
- 🧴 Isopropyl alcohol (90%+) — clean-up.
- 🔍 Loop or magnifying glass - so as not to miss small latches.
If you are first in smartphone repair, we recommend that you also purchase protective gloves – glue and alcohol can irritate the skin. Do not use metal tools (screwdrivers, knives), as they leave scratches on the frame and can close contacts on the board.
Selection of the back cover: original vs analog
The quality of the spare part depends not only on the appearance, but also on the tightness of the body, protection against dust / moisture (even if the Redmi Note 9 Pro does not have an official IP68 standard), as well as the reliability of the antenna lines.
| Type of cap | Pluses | Cons | Cost (2026) |
|---|---|---|---|
| Original (OEM) | Perfect fit, retains all functions (NFC, wireless charging), original glue | Expensive, hard to find in retail, often faked | 2500–4000 ₽ |
| Certified analogue (e.g. from Huaqin) | Cheaper than the original, good quality plastic/glass, retains NFC | There may be small gaps, glue will have to be purchased separately. | 1200–2000 ₽ |
| Uncertified analogue (no-name) | Very cheap, easy to find. | Bad landing, may not match camera/microphone holes, often breaks when installed | 500–1000 ₽ |
How do you tell the difference between the original lid and the fake one?
- 🏷️ Marking – On the inside of the original is the Xiaomi logo and serial number.
If you choose an analog, be sure to check the reviews of the seller and request a photo of the real product. For example, AliExpress often sells covers with a defect - a mismatch of holes under the fingerprint sensor.
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Before buying, take a picture of the inside of your old lid and compare it to the seller's photo. Pay special attention to the location of the flexible plumes of the antennas - they should match up to a millimeter.
Step-by-step: Removing the old cover
This is the most critical step, and if you act in a negligent manner, you can damage the plumes of the display, the battery, or the antennas.
- Turn off your smartphone and remove it. SIM-This will prevent short circuits from heating up.
- Heat the cover with a hair dryer around the perimeter for 2-3 minutes, keeping it at a distance of 5-7 cm The temperature should be 60-80 ° C (not higher, otherwise the screen will damage!).
- Stick the suction cups to the top and bottom of the lid (near the camera and USB-C connector).
- Carefully pull the suction cups while putting the lid on with a plastic spatula. Start at the bottom edge, there are fewer plumes.
- Remove the plumes (if the lid doesn't lend itself, reheat the problem area). Redmi Note 9 Pro has three of them: 📶 The antenna plume (upper part). 🔋 Battery plume (centre). 📷 Camera plume (if the camera cover is on one module).
If the lid is glued too hard, don't put too much effort - better repeat the heat. In the Redmi Note 9 Pro, the battery plume is attached to the lid with double-sided tape, not glue - it can be gently peeled off without heating.
Is the smartphone off?|Whether extracted SIM-map?|Is there a replacement cover for the replacement?|Suction pads and shoulder blades prepared?|Checked the temperature of the hair dryer (not higher than 80)°C)?-->
⚠️ Attention: If you hear a crack when you remove the lid, it's the snaps of the body, in which case you'll have to put the new lid on the glue, because the mechanical mounting is broken.
Installation of a new cover: gluing and fixing
Now you need to fix the new lid correctly, and there are many mistakes that make it go away or creak.
- Clean the frame of the case of old glue with isopropyl alcohol. Use cotton swabs or a soft brush.
- Apply new glue: For double-sided tape, stick the strips around the perimeter, stepping 1-2 mm away from the edges (to avoid disturbing the latches). For B-7000 glue, apply a thin layer to the frame of the case, avoiding contact.
Set the lid.
Hold the latches.
Check the leakage.
After installation, do not turn on the smartphone for at least 2 hours - the glue should completely dry. If you use the B-7000, the drying time increases to 4-6 hours.
⚠️ Warning: Do not use superglue or Moment glue – they can damage the plastic and make the next replacement of the cover impossible without breaking the case.
What to do if the cover is not glued?
Checking the performance after replacement
Even if the lid is externally installed correctly, the internal components may have been affected.
- 📶 Network and Wi-Fi – if the antenna plumes are damaged, the signal will be weak or disappear altogether.
- 🔋 Charging – connect the charger and make sure the smartphone detects the cable.
- 📷 Camera and fingerprint sensor – sometimes when the cover is replaced, the plumes move, and these modules stop working.
- 🔊 Speakers and microphone – check the sound on calls and music playback.
If something doesn't work, don't panic, because often the problem is solved by reconnecting the plumes.
- Remove the lid again (carefully so as not to damage the new glue!).
- Check if all the connectors on the motherboard sit tightly.
- If necessary, clean the contacts with alcohol and connect again.
If problems persist after reassembly, the plumes may be damaged, in which case they will need to be replaced (this is already more difficult to repair).
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After replacing the cover, make sure to make a test call and check all the sensors. NFC and wireless charging (if any) are most often affected, since their antennas are located under the cover.
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when replacing the cover with the Redmi Note 9 Pro. Here are the most common of them and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Overheating by a hairdryer (>80°C) | Deformation of plastic, detachment of the display, battery damage | Use a thermometer or keep your hair dryer at a safe distance. |
| Use of metal tools | Scratches on the frame, closing contacts | Work only with plastic blades |
| Incomplete cleaning of old glue | The new cover is poorly held, gaps appear | Use alcohol and cotton swabs for thorough cleaning |
| Incorrect application of glue (too much or little) | The cover is "walking" or sticking crooked | Apply the glue in a thin layer, stepping 1 mm away from the edges |
| Forgot to disconnect the battery plume before heating | Short circuit, failure of the power controller | Always extract. SIM-Disconnect the battery (if possible) |
Another common problem is the creaking of the new lid.
- 🔧 Smooth fit (you need to press the latches more tightly).
- 🧴 Excess glue (remove excess alcohol).
- 📦 Defect of the cover itself (check it on a flat surface before installation).
If the creak does not disappear after 1-2 days, try to remove the lid and glue it again, paying special attention to the corners.
Alternatives: When a replacement is not needed
It's not always that a crack or scratch on the lid requires a complete replacement, and in some cases, you can do with simpler, cheaper solutions.
- 🖌️ Scratching polish – if the damage is shallow, use paste GOI Or a toothpaste with a fine abrasive, and then you can use a microfiber cloth in a circular motion.
- 🎨 Vinyl skin covering - hides small cracks and protects against new damage.Skin for Redmi Note 9 Pro costs 300-500 ₽.
- 🔧 Local crack repair – glass covers can be used UV-glue, LOCTITE 3321. Apply it on a crack and illuminate it with a UV lamp.
- 🛡️ Bumper installation – a silicone or plastic case with reinforced corners will prevent further damage.
These methods will be suitable if:
- The crack does not affect functionality (does not affect the camera or sensors).
- You don’t plan on selling a smartphone (cosmetic repairs can reduce the cost of it).
- You don’t have experience disassembling smartphones (replacing the lid is a risky procedure for beginners).
If the lid moves away from the body, chipped at the camera or damaged antenna, a complete replacement is inevitable.