Why 5G Wi-Fi isn't working: A full breakdown of the causes and solutions

You turned it on on the router 5G Wi-Fi, but the devices stubbornly do not see the network or connect only to 2.4 GHz? Or is the speed on the new frequency lower than on the old one? The problem is more common than you might think—even among owners of flagship routers like ASUS RT-AX88U or TP-Link Archer AX6000In 90% of cases, the culprit is a problem with settings, hardware limitations, or external interference, not defective hardware.

In this article - A complete checklist of reasons why 5G Wi-Fi might not work or work poorly., with step-by-step instructions for each. We'll explore how to distinguish hardware limitations from software glitches, why a laptop can't see the network while a smartphone can, and what to do if the speed on 5 GHz is slower than on 2.4 GHz. No general advice—only specific steps with explanations.

Spoiler: If your router is older than 2018, the problem may be due to an outdated standard. 802.11ac Wave 1 - it doesn't support modern channels 160 MHz and technologies like OFDMABut even in this case, there are ways to get the most out of your existing hardware.

1. The device does not support 5G Wi-Fi: how to check

The first thing to rule out is hardware incompatibilityNot all gadgets can work with 5 GHz networks, even if they were released after 2020. For example, budget smartphones Redmi 9A or Samsung Galaxy A03s support only 2.4 GHz, and some laptops (especially cheap models on Intel Celeron) may have a Wi-Fi adapter without support 5 GHz.

How to check:

• 📱 Smartphones/tablets: go to Settings → Wi-Fi and see if the network is listed with a mark 5G or 5 GHzIf not, check the model specifications on the manufacturer's website (look for the line Wi-Fi standards or Frequency bands).
• 💻 Laptops/PCs: V Windows open Device Manager → Network Adapters, find your Wi-Fi module (for example, Intel AX200 or Qualcomm Atheros QCA61x4) and check its specifications online.
• 📺 Smart TV/set-top boxes: There should be a frequency selection option in the network menu. If there isn't one, the device only works on 2.4 GHz.

Special attention to old devices: Even if they support 5 GHz, their adapters may not work with modern standards like 802.11ax (Wi-Fi 6). For example, iPhone 6/6S or MacBook Pro 2015 do not support 160 MHz channels, due to which the speed will be limited.

⚠️ Note: If your device was released before 2016, there is a high probability that it does not support 5 GHz or only supports legacy standards (eg 802.11n at a frequency of 5 GHz). In this case, the only option left is to upgrade the hardware or use 2.4 GHz.

2. 5G Wi-Fi is disabled in the router settings.

A common reason is - the 5 GHz network is simply turned off In the router's admin panel. Many users aren't even aware that their router supports two separate networks (2.4 and 5 GHz), and the second one may be disabled by default.

How to enable:

1. Go to your router's control panel (usually at 192.168.0.1 or 192.168.1.1, login/password — admin/admin or indicated on the sticker).
2. Find the section Wi-Fi (or Wireless, Wireless network).
3. Check if there are separate settings for 2.4 GHz And 5 GHzIf yes, enable the second network (check mark Enable 5G Wi-Fi or similar).
4. Save the settings and reboot the router.

On some routers (for example, Keenetic or Zyxel) 2.4 and 5 GHz networks can be combined into one Smart ConnectIn this case:

• 🔄 Turn it off Smart Connect in the Wi-Fi settings.
• 📡 Set different names (SSID) for 2.4 GHz And 5 GHz (For example, MyWiFi_2G And MyWiFi_5G).
• 🔒 Set the same password for both networks.

3. Wrong channel or airtime congestion

The 5 GHz network is more sensitive to interference And channel selection, than 2.4 GHz. If you live in an apartment building, there's a good chance your neighbors are also using 5 GHz, and their networks overlap with yours. This leads to connection drops, slow speeds, or no signal at all.

How to check and fix:

1. Install a Wi-Fi analysis app on your smartphone (for example, WiFi Analyzer for Android or NetSpot for iOS/macOS).
2. Look at what channels 5 GHz are occupied by neighboring networks. It is optimal to choose the least loaded channel in the range 36–48 or 149–165 (they intersect less).
3. Change the channel to a free one in your router settings. If your router supports it, DFS (dynamic frequency selection), enable this option - it will automatically select the least loaded channel.

Important: 5 GHz channels are available in Russia and Europe 36–48 And 149–165. Channels 50–144 (DFS) can be used, but the router will periodically check them for radars (this may cause short-term interruptions).

⚠️ Attention: If the network disappears completely after changing the channel, check whether your device supports the selected range. For example, channels 149–165 may not work on older smartphones or laptops.

4. The channel width is too large or too small

Channel width (Channel Width) directly affects the speed and stability of the connection. If you set 160 MHz, the speed will be maximum, but the network will become unstable - especially in conditions of interference. If you choose 20 MHz, the connection will be stable, but slow.

Optimal settings:

• 🏠 Apartment in a multi-apartment building: 40 MHz or 80 MHz (if the router supports it).
• 🏡 Private house: 80 MHz or 160 MHz (if devices support it).
• 🏢 Office with a large number of devices: 20 MHz or 40 MHz for stability.

How to change:

1. Find the section in the router admin panel Wi-Fi → 5 GHz → Channel Width (or similar).
2. Select the appropriate channel width (eg. Auto 20/40/80 MHz).
3. Save the settings and reboot the router.

5. Problems with drivers or firmware

If 5G Wi-Fi used to work, but suddenly stopped working., the following may be to blame:

• 🔄 Update Windows/macOS/iOS/Android, after which the Wi-Fi adapter driver crashed.
• 🖥️ Outdated router firmware, does not support modern standards.
• 🐛 Bug in the adapter driver (often found on laptops with Realtek or Medatek chips).

How to fix:

For computers (Windows/macOS/Linux):

1. Open device Manager (Win + X → Device Manager).
2. Find your Wi-Fi adapter (in the section Network adapters).
3. Right click → Update driver → Automatic search.
4. If it doesn't help, download the driver from the manufacturer's website (for example, for Intel AX200 - With intel.ru, For Realtek RTL8821CE — from the laptop manufacturer’s website).

For router:

1. Check the current firmware version in the admin panel (section System Tools or Administration).
2. Download the latest firmware from the manufacturer's official website (for example, for ASUS - With asus.com, For TP-Link - With tp-link.com).
3. Update the firmware via the web interface (section Firmware Upgrade).

⚠️ Note: If 5G Wi-Fi is completely lost after updating your driver or firmware, roll back to the previous version. Routers usually have an option for this. Factory Default (factory reset) or the ability to load the old firmware manually.

netsh wlan show drivers

6. Interference from other devices or walls

Signal 5 GHz fades more and more When passing through obstacles, it's better than 2.4 GHz. If the router is located at one end of the apartment and you're trying to connect at the other, the signal may simply not reach. 5 GHz is also affected by:

• 📡 Other neighbors' routers (especially if they use the same channels).
• 🔌 Household appliances: microwaves, cordless phones, baby monitors.
• 🪟 Walls and ceilings: Concrete, metal, and mirrors greatly weaken the signal.
• 🌿 Plants and aquariums: Water absorbs 5 GHz radio waves.

Solutions:

• 📍 Move the router in the center of the apartment or closer to devices that need to connect via 5 GHz.
• 📶 Use a Mesh system (For example, TP-Link Deco or Google Nest Wi-Fi), if the area is large.
• 🛡️ Install a repeater with 5 GHz support (eg Xiaomi Wi-Fi Range Extender Pro).
• 🔌 Turn off sources of interference (such as a cordless phone) or move them further away from the router.

If the problem is in the walls, try direct the router antennas vertically (for up/down signal distribution) or at a 45° angle (for diagonal coverage). On some models (e.g., ASUS RT-AX86U) the antennas are removable - they can be replaced with more powerful ones.

7. Security settings or MAC filtering

Sometimes 5G Wi-Fi doesn't work due to incorrect security settings or included MAC filtering. For example:

• 🔐 An outdated encryption type has been selected (WEP or TKIP), which is not supported by modern devices.
• 🚫 Enabled MAC filtering, and your device is not whitelisted.
• 🔄 Different passwords for 2.4 GHz And 5 GHz (the device connects to one network, but does not see another).

How to check:

1. In the router admin panel, go to Wi-Fi → Security (or Wireless Network → Security).
2. Make sure encryption is selected. WPA2-PSK or WPA3-PSK (Not WEP!).
3. Check if it is enabled MAC filtering (chapter MAC Filtering or Access control). If yes, disable it or add the MAC address of your device.
4. Make sure the passwords for 2.4 GHz And 5 GHz the same (if the networks are separated).

If you use WPA3, but older devices (eg Android 9 or Windows 7) do not connect - try switching to WPA2 or enable mixed mode WPA2/WPA3.

8. Hardware faults of the router or adapter

If you've tried everything and 5G Wi-Fi still isn't working, the problem might be iron:

• 🔌 The router's 5G module is faulty. (for example, after a power surge).
• 🖥️ The Wi-Fi adapter is broken on a laptop or PC.
• 📡 The antenna is damaged (for example, after a router crash).

How to diagnose:

1. Check your router: Connect another device (smartphone, tablet) to it. If 5G Wi-Fi doesn't work on either device, the problem is with the router.
2. Check the device: Try connecting to a different 5G network (for example, at a cafe or at a friend's place). If it doesn't connect, the problem is with the adapter.
3. Inspect the antennas: If they are removable, try twisting them slightly or replacing them (if you have spare ones).

If your router is under warranty, contact a service center. If not, you can try:

• 🔧 Reset the router to factory settings (button Reset on the back panel).
• 🔌 Connect an external Wi-Fi adapter to a PC/laptop (for example, TP-Link Archer T4U).
• 🔄 Replace the router, if he is older than 5 years (modern standards like Wi-Fi 6 require new hardware).

⚠️ Caution: If your router becomes hot or makes unusual noises (squeaking, crackling), unplug it immediately! These are signs of a serious malfunction that could cause a fire.

FAQ: Frequently Asked Questions about 5G Wi-Fi