Xiaomi Network Problems After Security Update

Quick Answer:
If your mobile data stopped working after a security update on Xiaomi, first toggle Airplane mode ON for 30 seconds, then OFF – this often forces the phone to re-register on the network. Then go to Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → ensure it's set to 5G/4G/3G auto. If still not working, reset APN settings (Access Point Names → three dots → Reset to default). Security updates can sometimes reset these settings without warning.

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS, including Redmi Note series, POCO X/F series, and Xiaomi flagships. Recent security patches may affect carrier settings or network registration.

🔍 Quick Start – Find Your Path

  • If your 4G/5G signal icon is missing completely: Start with Section 1 (Network Re-registration).
  • If your 4G/5G signal icon is visible but internet doesn't work: Go straight to Section 2 (APN Reset).

Section 1 – Network Re-registration Fix (If Signal Icon Is Missing)

Security updates can reset your phone's network registration state. After a reboot, your phone may not have reconnected to your carrier's network properly.

Try these in order:

  1. Toggle Airplane mode – ON for 30 seconds, then OFF. Wait 60 seconds. This forces the phone to re-register on the network.
  2. Check preferred network type – Settings → SIM cards & mobile networks → [Carrier] SIM → Preferred network type → Select 5G/4G/3G auto (not "3G only" or "5G only"). Security updates can reset this setting.
  3. Restart your phone – A second reboot after the update can sometimes fully apply all network changes.
  4. If signal icon returns but still no internet: Proceed to Section 2.

Section 2 – APN Reset (If Signal Icon Is Visible But No Internet)

Security updates can sometimes reset or reconfigure APN settings. This is one of the most common causes of "4G/5G icon visible but no internet" after an update.

Try these in order:

  1. Reset APN to default – Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → three dots menu → Reset to default → OK.
  2. Restart your phone – After reset, restart and test mobile data.
  3. Check your APN is selected – After reset, go back to Access Point Names and ensure the dot is next to your carrier's APN (it should auto-select, but sometimes doesn't).
  4. If still not working: Manually create a new APN using your carrier's settings. APN values vary by carrier – contact your carrier or check their website.

Section 3 – SIM Reset (If Sections 1-2 Didn't Work)

Sometimes the update can cause the SIM card profile to not load correctly. Before going deeper, test your SIM in another phone.

  1. Test your SIM in another phone – If data works on another phone, the problem is your Xiaomi (continue below). If data fails on another phone, the problem is your SIM or carrier – call your carrier.
  2. Power off your phone
  3. Remove SIM tray and take out the SIM card
  4. Wait 30 seconds (longer to ensure full power drain)
  5. Reinsert SIM firmly and power on
  6. Wait 2 minutes – check if mobile data is restored.

Section 4 – Reset Network Settings (Last Resort)

⚠️ Removes saved Wi-Fi passwords and paired Bluetooth devices. Does not delete photos or contacts.

Path: Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth

After reset: Restart your phone → Reconnect to WiFi (enter password) → Re-enable VoLTE if needed → Test mobile data.

Only do this if Sections 1-3 didn't work.

📞 Rare Cases – Carrier-Specific Issues

In very rare cases, some carrier-branded Xiaomi phones (bought directly from EE, O2, Vodafone, or Three) may have delayed security updates because carriers test them before release. If you've tried everything above and mobile data still doesn't work, contact your carrier:

  • EE: 150 or 0800 956 6000
  • O2: 202 or 0344 809 0202
  • Vodafone: 191 or 0333 304 0191
  • Three: 333 or 0333 338 1001

Ask them: "I installed the latest security update and now have mobile data problems – is there a known issue with this update on my device?"

Why Does Mobile Data Stop Working After Security Updates?

  • APN settings reset – Security updates can reset APN settings to default values, which may not match your carrier's requirements.
  • Modem firmware changes – Security patches often include modem or radio stack updates that can change how your phone connects to the network.
  • Preferred network type reset – The update can change your preferred network type to "5G only" or "3G only", causing connection issues.
  • Network registration state – After an update, your phone may not re-register on your carrier's network correctly on first boot.

Quick Questions

Why does mobile data stop working but calls still work?
This usually means APN settings were reset during the update. Your phone can connect to the network for calls (which use a different channel) but can't route internet traffic. Go to Section 2 (APN Reset).

Can a security update change APN settings?
Yes. Security updates can reset APN settings to default values. This is one of the most common causes of "no internet after update" issues.

Why does 5G disappear after an update?
The update may have changed your preferred network type to "5G only" or "3G only". Go to Settings → SIM cards & mobile networks → [Carrier] SIM → Preferred network type → select 5G/4G/3G auto.

Should I uninstall the security update?
No. Security updates are important for device protection. Try the fixes in this guide first – most network issues can be resolved with simple settings changes.

Will resetting network settings delete my photos?
No. Only saved Wi-Fi passwords and Bluetooth devices are removed.

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