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To avoid security vulnerabilities on a newly installed wireless router, updating the firmware is essential. Firmware updates provide necessary patches for known security vulnerabilities, ensuring that the router is equipped to fend off potential threats. Manufacturers regularly release updates to address issues that may have been discovered post-release, making it critical to keep the device's firmware current. This action helps protect the network from exploits that hackers might leverage.

While changing the default username and password is an important security practice, firmware updates are crucial for patching specific vulnerabilities that could be exploited regardless of the admin credentials. Additionally, enabling guest networking and connecting via a VPN provide enhanced security measures, but they do not address the router's inherent vulnerabilities as effectively as updating the firmware does. Thus, ensuring your router is running the latest firmware is a fundamental step in establishing a secure wireless network.