Set Up UCSS on Router (Merlin Modified)

The official version of Merlin were deleted the function using  Shadowsocks. Merlin Koolshare Modified version should be used.

Merlin and Openwrt Koolshare modified ROM is a firmware customized by a third party. Please note that due to the nature of routers and firmware, UCSS does not provide support for router configuration, cannot be held responsible for troubleshooting firmware problems or router failures. Please refer to the setting method here after acknowledging.

The detailed setting method may vary depending on the model. Please search here for the setting method corresponding to each model.

Compatible models

The speed when using Shadowsocks from Merlin greatly depends on the performance of the router.


  • R6300v2
  • RAX80


  • RT-AC56U
  • RT-AC66U
  • RT-AC66U-B1
  • RT-AC68U
  • RT-AC86U
  • RT-AC87U
  • RT-AC88U
  • RT-AC3100
  • RT-AC3200
  • RT-AC5300
  • GT-AC5300
  • RT-AX82U
  • RT-AX88U
  • TUF-AX3000
  • GT-AX11000

How to set Merlin (Modified ROM)

Firmware download

Download firmware of the applicable router.

Download Koolshare Modified ROM here: Koolshare 固件下载服务器

Currently regularly updated models are New_Gen_384, ASUS Official Mod, RAX80. Please note that the Shadowsocks plug-in may not be available for other models.

Access the router and login

Router IP is normally set at If you can not find it please check the router IP from the control panel or system configuration > network.

Internet Explorer may not be able to connect normally. Please set it from Google Chrome which is the recommended browser of Koolshare.

Upload the firmware

“Administration” > “Firmware upgrade” > Upload the downloaded firmware to the new firmware file. Firmware rewriting is completed in a few minutes.

JFFS format

Select “Yes” for the two items in “Administration” > “System” > “Persistent JFFS2 Partition” and click “Apply”.

Be sure to perform this format. It hinders the operation.

Firewall settings

Select “Merlin” of “Nat Loopback” in “Firewall” and “apply”.

Copy the subscription URL from the UCSS client area

Copy the subscription URL from UCSS “client area” > “service” > “product management”.

Install KoolSS (Shadowsocks plugin)

“科学上网” plugin has been deleted. Please download from the client area > download and install it from “离线安装” on the screen below.

GT-AC5300, RT-AC86U are used by different firmware download page and plug-in to use. Please download the plug-in about GT-AC5300 and RT-AC86U from the download page. About firmware, please refer to Koolshare community site for how to set up the corresponding firmware.

Load the serveres

Since the plugin is displayed in “已安装”, click it to open it.

The next screen will pop up, so click “订阅节点”.

If it is not displayed, you can display the same screen from “更新管理”.

Paste the subscription URL in “订阅地址管理” along the screen below.

Choose the third “游戏模式” (Run with UDP and TCP) from the “订阅节点模式设定” just below it. Those who do not need UDP select the fourth “全局代理模式” (Global mode).

After setting, click “保存并订阅”.

A loading screen will be displayed and all server information will be loaded.

Setting up KoolSS

Select “运营商DNS” from 选择国内DNS > 运营商DNS. Select 选择国外DNS set to “ss-tunnel”. Click “保存&应用” after setting.

Select Server and Connection

Select a server from “节点选择”.

Then switch on with “科学上网开关”. The connection to the server is started with “保存&应用”.

If you want to turn off the connection to the server, you can switch at “科学上网开关” on this screen.