AsusWrt-Merlin Firmware 3.0.0.4.378.55 Beta 2 for RT-AC66U Download

Posted at February 22, 2025 by PCI-DB Team

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Device Name	AsusWrt-Merlin Firmware 3.0.0.4.378.55 Beta 2 for RT-AC66U
Category	Router Switch Access Point
Manufacturer	ASUS
File Size	29.6 MB
Supported OS	OS Independent

AsusWrt-Merlin Firmware 3.0.0.4.378.55 Beta 2 for RT-AC66U Description

The AsusWrt-Merlin firmware was developed with the primary goal of boosting the original ASUS firmware, fix bugs and also add new improvements. This package includes a customized firmware targeted at ASUS routers that brings various changes without modifying the interface of the original firmware.

Changes:

- CHANGED: Updated dnsmasq to 2.73 RC9 (backport from GPL 6975)
- CHANGED: Updated odhcp6c to newer version (backport from GPL 6975)
- CHANGED: Updated openssl to 1.0.2d (fixes CVE-2015-1793, only present in Beta 1- 54_2 was not affected)
- CHANGED: Display existing key/certs on the OpenVPN pages once they've been migrated to JFFS.
- FIXED: Time scheduler-related features (Parental Control & Wifi scheduler) were broken (backported fix from Asus's GPL 6975) (beta 1 regression)
- FIXED: QTN firmware was still being copied to RAM rather than rely on the symlink to flash added in Beta 1, to save 4 MB of RAM. (AC87U)
- FIXED: Dropbox cloud sync would fail on some setups (backport from GPL 6975)
- FIXED: Entware-setup script would generate an invalid services-start script
- FIXED: Duplicate zoneedit entry on the DDNS service list.

Installation Notes:

- This custom firmware can be applied like any regular update.
- You should not need to reset to factory defaults.
- You can revert back to an original ASUS firmware at any time.
- Do not load a saved copy of your settings.

About Router Firmware:

Before you consider downloading this firmware, go to the system information page of the router and make sure that the currently installed version isn’t either newer or matching this release.

Due to the large variety of router models and different methods for upgrading the device, it is highly recommended that you read and, above all, understand the installation steps before you apply the new firmware, even if you are a power user.

In theory, these steps shouldn’t be much of a hassle for anyone, because manufacturers try to make them as easy as possible, even if they don’t always succeed. Basically, you must upload the new firmware to the router through its administration page and allow it to upgrade.

If you install a new version, you can expect increased security levels, different vulnerability issues to be resolved, improved overall performance and transfer speeds, enhanced compatibility with other devices, added support for newly developed technologies, as well as several other changes.

If you’re looking for certain safety measures, remember that it would be best if you perform the upload using an Ethernet cable rather than a wireless connection, which can be interrupted easily. Also, make sure you don’t power off the router or use its buttons during the installation, if you wish avoid any malfunctions.

If this firmware meets your current needs, get the desired version and apply it to your router unit; if not, check with our website as often as possible so that you don’t miss the update that will improve your device.

  It is highly recommended to always use the most recent driver version available.

Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.

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