Why Xiaomi Redmi 6A see SIM-map and how to fix it yourself

Xiaomi Redmi 6A — One of the most popular budget smartphones of the brand, but even it is not immune to recognition problems SIM-If your machine suddenly stops seeing the network, it says, "No." SIM" or requires PUK-code for no reason, don't rush to the service center. 80 percent of the time, you can solve the problem yourself in 10 to 30 minutes.

In this article, we will analyze all possible causes - from banal contamination of contacts to software failures. MIUI. You will learn how to diagnose a malfunction, which settings to check first, and when repairs are really needed, and we will also share unique life hacks that you will not find in standard instructions (for example, how to bypass a lock). IMEI after a failed update).

It is important that the smartphone has never seen SIM-The card from the moment of purchase, most likely, the problem in the hardware (damaged slot or antenna module), in which case, immediately go to the section on the diagnosis of iron.

Signs of malfunction: how to accurately identify the problem

Before proceeding with the repair, make sure you correctly diagnose the problem. SIM-map 6A may manifest differently:

• 📵 No network - the status bar displays a cross or the inscription "No services", although SIM-map inserted.
• 🔍 "No. SIM-Cards – the smartphone says that the slot is empty, although the card is in place.
• 🔒 Demands. PUK-code – requests unlocking without prior input attempts PIN.
• 📶 Constant network search – the indicator flashes, but the connection is not established.
• 📱 He only sees. 2G — smartphone only catches EDGE, though the card supports 4G.

Pay attention to the context of the problem:

• 💦 After getting moisture or falling?
• 🔄 After updating MIUI?
• 🔌 After battery replacement?
• 📲 After installing custom firmware?

This will help narrow down the possible causes, for example, if the problem occurred after an update, there is a 95% probability that the software is to blame, and if the smartphone fell or wet, check the hardware.

Software failures: how to return recognition SIM repairless

60% of cases Xiaomi Redmi 6A see SIM-map due to firmware or network settings, start with the simplest methods and gradually move on to more complex ones.

1. Reboot and hot reset

It sounds trivial, but it works 30 percent of the time. SIM) Sometimes it freezes because of conflicts with other processes:

1. Turn off the smartphone with a long press on the power button.
2. Get it. SIM-card, battery (if removable) and wait 1 minute.
3. Put it back in and turn it on.

If the usual reboot didn’t help, run a hot reset:

1. Press Volume Up + Power for 10-15 seconds.
2. When the Xiaomi logo appears, release the buttons.
3. Wait for the full load (up to 5 minutes).

2. Resetting network settings

Incorrect parameters APN Conflicts with the operator may block recognition SIM. To reset network settings:

1. Go to Settings. → SIM-maps and mobile networks → Additionally. → Resetting network settings.
2. Confirm the action (required) PIN-code).
3. Reboot your smartphone.

After the reset, you'll have to do it again.

• 📶 Enter. PIN-code SIM-map.
• 🌐 Connect to Wi-Fi.
• 📱 Set up APN (Usually the settings are loaded automatically).

💡

If the Internet is lost after resetting, manually add APN The parameters can be found on the official website (for example, for MegaFon: Internet in the field). APN, mm MMS).

3. Update or roll back firmware

If the problem has occurred after the MIUI update, try:

• 🔄 Reverse to the previous version through Settings → The phone. → Updating the system → Three points. → Select a Service Package.
• 🆕 Install the latest stable firmware through the official Xiaomi website.

For Redmi. 6A current-stage:

⚠️ Note: If after the update, the smartphone stopped seeing IMEI (into *#06# show "Null/Null"), Don't try to flash it through Fastboot, it can block the modem. In this case, contact the service immediately.

Manual switching of network mode

Sometimes the smartphone “forgets” in what mode should work SIM-To reset the settings:

1. Go to Settings. → SIM-maps and mobile networks → Your name. SIM → Type of network.
2. Select Only. 2G, Wait 30 seconds.
3. Come back and choose. 4G (recommended).

If the network does not appear after that, try manually specifying the operator:

1. In the same menu, select Network Operators. → Networking.
2. Wait until the search is completed (it can take up to 2 minutes).
3. Choose your operator manually.

Problems with SIM-Map: What to check first

Before digging into the smartphone settings, make sure the problem isn’t in the very first place. SIM-Here's a checklist for diagnostics:

Pay special attention to the physical condition of the card:

• 🔍 Scratches on a chip – even microscopic damage can block contact.
• 📏 Wrong size - Redmi 6A It only supports nano-SIM. If you insert a micro-SIM with an adapter, it can hang around in the slot.
• 💧 Contact oxidation – green plaque on the metal part of the map indicates corrosion.

If the card looks fine, but the smartphone does not see it, try to activate it again:

1. Call the operator (from another phone) and ask for a message. SMS activation-instruction.
2. Put it in. SIM redmi 6A and wait SMS (It can take up to 24 hours).
3. If SMS Not coming, request a replacement card in the operator’s cabin.

⚠️ Note: If you are using a virtual SIM (eSIM, then Redmi 6A It doesn't support it. In this case, you'll need a physical nano-SIM from the operator.

Hardware malfunctions: when you need to disassemble

If the software methods didn't help, the problem is most likely hardware. - Xiaomi Redmi 6A most often:

1. Slot SIM-cards - contacts are oxidized or the fixator breaks.
2. Antenna module - damaged tracks on the board after falling.
3. Modem chip – overheats or moves away from the board.
4. Battery – Bloating can put pressure on the slot SIM.

Before you carry your smartphone to the service, you can conduct the initial diagnosis yourself:

1.Slot check SIM-map

You'll need:

• 🔦 A flashlight (or flashlight on another phone).
• 🧲 Lupa (optional).
• 🧴 Alcohol and cotton swab.

Instructions:

1. Turn off your smartphone and get the tray out. SIM-map.
2. Light a flashlight into the slot - there should be 6 gold contacts (3 on each side).
3. If the contacts are blackened or covered with green plaque, gently wipe them with alcohol.
4. Check if the metal lock inside the slot is bent (it should spring when pressed).

⚠️ Warning: Do not use abrasive materials (steelpaper, needles) for cleaning, this will damage the coating of contacts!

Diagnostics of the antenna module

If the smartphone doesn't catch the network even after cleaning the slot, the problem may be in the antenna.

1. Enable the Engineering Menu mode: dial ##4636##.
2. Go to the tab Information about the phone.
3. Look at the network signal parameter: If the value -120 dBm or unknown, the antenna is not working. -85 before -110 dBm – signal is present but weak (possibly operator problem).

If the signal is missing and the slot is clean, the antenna track on the board is likely to be damaged, in which case only soldering or replacing the module in the service will help.

3. Checking the battery pressure on the slot

Redmi 6A known problem when the bloated battery presses on the slot SIM-To check out the maps:

1. Turn off your smartphone and remove the back cover (a mediator or plastic card will be required).
2. Examine the battery - if it swells (the "bubble" appeared), it must be replaced urgently.
3. Try to slightly press the battery in the slot area. SIM If the network is there, the pressure is the problem.

Restore IMEI on the Redmi 6A two ways:

1. through the engineering menu (if IMEI just dropped off)

This method works if IMEI disappeared after resetting, but was not physically erased.

1. Dial ##36446337# (or #4636## → Phone information → Choose. SIM → Turn on the radio).
2. Go to Connectivity → CDS Information → Radio Information.
3. In the field AT+ enter: AT +EGMR=1,7,"Yours_IMEI_1" AT +EGMR=1,10,"Yours_IMEI_2" (IMEI You can find it on a box or under a battery).
4. Press Send AT Command.
5. Reboot your smartphone.

2. through the firmware of modem-partitions (if IMEI erased)

If the first method did not work, you will need to flash modem sections through Fastboot:

1. Download the original firmware for your model with Xiaomi Firmware Updater.
2. Unpack the archive and find the files. modemst1.img and modemst2.img.
3. Install Platform Tools and connect your smartphone to your PC in Fastboot mode (clamp Volume Down). + Nutrition).
4. Enter commands: fastboot flash modemst1 modemst1.img fastboot flash modemst2 modemst2.img fastboot reboot

⚠️ Note: If after these manipulations IMEI You have not recovered, don’t try the generators. IMEI It's illegal and can permanently block the modem, in which case, contact the service center with a check for the purchase.

💡

If IMEI missing after update MIUI, First, try to roll back to the previous firmware version, and 70 percent of the time, it restores the identifiers without manual intervention.

When to contact the service: prices and guarantees

If all of the above methods didn't work, the problem is probably hardware. 6A in service centers (for 2026):

Before you carry your smartphone for repair:

• 📄 Check if the warranty is valid (if the smartphone is officially purchased), in which case the repair can be free.
• 🔍 Take a picture. IMEI (on a box or under the battery – this will help prove that the smartphone is not blacklisted.
• 💰 Ask the craftsmen if the cost of the parts is included in the price. Often the price lists only the work.

⚠️ Please note: If you are asked to “sweep” IMEI" For 300-500 rubles, most likely, use illegal methods, which can lead to the locking of the smartphone operator in 1-2 months.

Prevention: How to avoid problems with SIM-map

To Xiaomi Redmi 6A Don’t lose contact at the most inopportune time, follow these rules:

• 🚫 Don't take it out. SIM-card with the smartphone on - this can damage the slot contacts.
• 💧 Avoid moisture – even a slight dampness leads to oxidation of contacts.
• 🔋 Watch the battery - at the first signs of bloating (the lid is poorly closed) replace it.
• 🔄 Don't update. MIUI through OTA, If the charge is below 50%, the interrupted update may be erased. IMEI.
• 📱 Don’t use unofficial firmware – they often break the modem.

We also recommend:

• 📡 Check the signal strength once a month in the engineering menu (##4636##). If it's always lower. -100 dBm, this is a sign of antenna problems.
• 🔄 Clean the slot once every six months. SIM alcohol (even if there is no visible contamination).
• 📦 Keep the box from your smartphone – it shows the original IMEI, which may be necessary for restoration.

If you travel frequently, carry a spare with you. SIM-Sometimes the recognition problems are caused by roaming, and changing the card helps to get the connection back.

FAQ: Frequent questions about problems with SIM redmi 6A