Although Asus' factory default firmware is generally more feature-rich than its competitors, [citation needed] Open source Linux-based router firmware projects such as DD-WRT, OpenWrt, Tomato Firmware and DebWRT are able to get better performance out of the devices and offer their users more flexibility and customization options.

RT-AC51U BIOS & FIRMWARE | Networking | ASUS USA The ASUS RT-AC51U router delivers simultaneous dual-band 2.4GHz and 5GHz Wi-Fi at up to 733Mbit/s and has high-efficiency antennas that strengthen Wi-Fi signal coverage by up to 150% compared to competing routers. A multipurpose USB port allows printer, hard drive and 3G/4G sharing, and ASUS AiCloud is supported. [About] Asuswrt-Merlin - custom firmware for Asus routers Apr 05, 2020 How to Choose the Best Firmware to Supercharge Your Wi-Fi

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Remember to follow the peacock thread first for background , use this page to identify your router model correctly, and use the dd-wrt download search page (DD-WRT Downloads page or secure version) to ensure that you are getting the correct file (or files, as often is required) for the job.

Boosting performance of Asus RT-N66U - Gunnar Peipman

Jun 28, 2020 RT-AC51U BIOS & FIRMWARE | Networking | ASUS USA The ASUS RT-AC51U router delivers simultaneous dual-band 2.4GHz and 5GHz Wi-Fi at up to 733Mbit/s and has high-efficiency antennas that strengthen Wi-Fi signal coverage by up to 150% compared to competing routers. A multipurpose USB port allows printer, hard drive and 3G/4G sharing, and ASUS AiCloud is supported. [About] Asuswrt-Merlin - custom firmware for Asus routers Apr 05, 2020