Many users who assemble a computer based on a motherboard ASRock B450M PRO4, often encounter a situation where the wireless connection doesn't work immediately after installing the operating system. This is because this model of the motherboard is budget-friendly and doesn't always come with a built-in Wi-Fi module, requiring the installation of additional hardware.
If you're sure the wireless adapter is physically present or connected via USB, but the system doesn't detect it, the problem may lie in the Basic Input/Output System settings. In some cases, BIOS may block the operation of certain ports or controllers, making it impossible to detect network equipment.
In this article, we'll cover in detail how to enable the necessary features in the UEFI BIOS, correctly detect the presence of a hardware module, and configure drivers for stable internet operation. You don't need to be an expert to complete these steps; just follow the steps carefully.
Checking the board's hardware compatibility
Before delving into software settings, it is necessary to clearly understand the design features of your motherboard Model ASRock B450M PRO4 in its basic configuration does not have a built-in Wi-Fi module and antenna connectors on the rear panel.
This means that for wireless networking to work, you'll need to purchase and install a separate adapter. Most commonly, these are PCIe cards that plug into an expansion slot or USB dongles. There are also specific versions of the cards with "AC" or "WiFi" in the name, but the standard one B450M PRO4 does not have this feature out of the box.
- 📡 Inspect the rear panel of the case: the presence of two threaded connectors for antennas indicates a built-in module.
- 💻 Open Device Manager in Windows: the presence of an unknown device may indicate that there are no drivers for the installed adapter.
- 🔌 Check the PCIe slots: Make sure the Wi-Fi card is firmly inserted into the slot and secured with a screw.
If you're using an external USB adapter, your BIOS settings primarily focus on managing the USB ports. The board's integrated Bluetooth/Wi-Fi module (if any) is configured in the Peripherals section. For a standard board, the key issue is the correct operation of the controller your device is connected to.
Entering the BIOS and navigating the menu
To access low-level system settings, you must enter the UEFI interface immediately after turning on the computer. Press the key F2 or Del several times in a row at the moment the logo appears ASRock.
By default, the system can boot into simplified mode. Easy ModeOnly basic information is displayed here: CPU temperature, voltage, and disk load order. This isn't enough to find network settings.
⚠️ Warning: Do not change processor voltage or RAM timings unless you are confident in what you are doing. This may result in system instability.
To access advanced settings, press the key F6 Or select the "Advanced Mode" button in the upper right corner of the screen. Only in this mode will you have full access to the chipset and peripheral configuration.
Setting up a USB controller in Advanced Mode
Once you are in advanced mode, find the tab AdvancedThis is where the parameters that control the motherboard's integrated controllers are located. We're interested in the section responsible for the southbridge or the USB controller itself.
On the menu South Bridge Configuration or USB Configuration You need to check the status of the ports. If you're using a USB adapter, make sure the ports aren't disabled. Sometimes users accidentally disable them through power-saving features.
Find the parameter USB Controller and make sure it is set to Enabled. It is also worth checking the option Legacy USB Support: its inclusion (Enabled) allows the system to recognize USB devices even before the operating system is loaded, which sometimes helps in diagnostics.
- 🔌 USB Controller: must be active for any USB devices to work.
- ⚡ XHCI Hand-off: Recommended to be enabled (
Enabled) for correct operation of USB 3.0 ports in modern operating systems. - 💤 ErP Ready: better to turn it off (
Disabled), as this feature may cut off power to ports when in a powered-off state, interfering with Wake on LAN.
After making changes, do not forget to save the settings by pressing the key F10 and confirming the action by selecting OKThe computer will restart and the changes will take effect.
Enabling PCIe slots and interrupts
If your Wi-Fi module is an expansion card installed in a PCIe slot, it's important to ensure the slot is active. In rare cases, interrupt conflicts may occur when multiple devices are installed.
In the section Advanced -> PCI Configuration (or similar, depending on the BIOS version) allows you to control resource allocation. However, for most users, the default settings are optimal.
What is IRQ and why is it needed?
An IRQ (Interrupt Request) is a signal from a device to the processor indicating the need to interrupt the current task and process data from the device. IRQ conflicts were a common problem in older systems, but modern UEFI BIOS versions and operating systems automatically and efficiently distribute these resources, minimizing the risk of conflicts. Manually adjusting these settings is only recommended for experienced users when diagnosing specific problems.
The main thing to check is physical contact. The card should be inserted until it clicks into place. If in the BIOS section System Status or PCI Information The connected device is displayed in the corresponding slot, which means the motherboard sees it.
☑️ Wi-Fi connection diagnostics
Table of basic BIOS parameters for network
For ease of understanding, we've compiled the key parameters that can affect network adapter operation into a single table. These settings are located in various subsections of the tab. Advanced.
| Parameter | Location | Recommended value | Influence |
|---|---|---|---|
| Onboard LAN | South Bridge / Chipset | Enabled | Activates the built-in Ethernet port |
| USB Controller | South Bridge / USB Config | Enabled | Enables operation of all USB ports |
| ErP Ready | ACPI Configuration | Disabled | Enables USB power when powered off |
| Wake on LAN | ACPI Configuration | Disabled/Enabled | Turning on the PC by a network signal (optional) |
Changing a parameter ErP Ready This is often overlooked. If it's active, the computer consumes less than 1 watt when off, but USB charging or wake-up functions may stop working.
Installing drivers and software
Even if the BIOS is configured correctly, the Windows operating system will not be able to work with Wi-Fi without the correct driver. Motherboard ASRock B450M PRO4 does not have built-in Wi-Fi, so you need to look for drivers for your specific adapter.
If you're using a USB adapter, connect it to a USB 2.0 port (black connector) for best initial compatibility. Windows 10 and 11 often automatically find basic drivers through Windows Update, but for stable operation, it's better to use software from the chip manufacturer (Realtek, Intel, Qualcomm Atheros).
⚠️ Note: Driver interfaces and the layout of options in Windows may change with the release of new operating system versions. Always check the latest documentation on your network adapter manufacturer's website.
To install drivers manually:
- Open device Manager (click
Win + Xand select the item). - Find the device with a yellow exclamation mark or under the "Network adapters" section.
- Right click -> "Update driver" -> "Browse my computer for driver software".
- Specify the path to the folder with the downloaded files.
Common problems and solutions
One common issue is the adapter disappearing from the list of available networks after waking from sleep mode. This is often related to Windows power settings, not the BIOS.
In Device Manager, find your Wi-Fi adapter, go to Properties, Power Management tab, and uncheck "Allow the computer to turn off this device to save power."
It's also worth checking out the service WlanSvc (WLAN AutoConfig Service) Click Win + R, enter services.msc and find this service in the list. It should be running and have the startup type set to "Automatic."
Additional questions (FAQ)
Does ASRock B450M PRO4 have an internal Wi-Fi antenna connector?
No, on the standard version of the board ASRock B450M PRO4 There's no dedicated connector (usually labeled WLAN_BT or similar) for connecting internal antennas. The board doesn't support installing internal M.2 Key E modules for Wi-Fi without using third-party adapters, which may not work properly.
Why doesn't the BIOS detect my USB Wi-Fi adapter?
The BIOS may not display a specific USB device in the peripheral list if it is not bootable. However, if the adapter is working properly, it should be detected in the USB Configuration as a connected device. If it's not listed anywhere, check the functionality of the USB port itself by connecting a flash drive or mouse.
Is it possible to flash the BIOS to enable Wi-Fi?
No, updating the BIOS (firmware) does not add hardware features. If the board physically lacks a radio module and antenna connectors, no software will add them. Flashing the BIOS can only fix errors in existing hardware.
What is the best wifi adapter for this motherboard?
For ASRock B450M PRO4 A PCIe adapter with an external antenna is the best choice, as it provides better speed and signal stability than USB-based adapters. Make sure the adapter supports the 802.11ac (Wi-Fi 5) or 802.11ax (Wi-Fi 6) standard for maximum performance.