Asus RT-AC88U User manual

ASUS Wireless routers trouble shooting
guide v2.6
1. Wireless network abnormal：
Computer cannot find wireless router
1. Confirm your wireless adapter in computer is turned on
2. Check whether your wireless adapter can search for the wireless SSID nearby.
3. Confirm the SSID and password you key in are correct

4. Check your router is NOT set to Hide SSID
What can I do if I forgot Wi-Fi password?
1. Set up your wireless router via wired connection

2. Enter router setting page (Key in setting page account and password)
3. Reset your password of router
Please go to [Wireless]>[General]
※ "WPA2-Personal" is recommended to use since it's the most safe encryption way

4. Click Apply to save your setting.
Computer cannot access to Internet through
wireless connection to router
1. Confirm whether SSID and password are correct

2. Confirm that computer can search for router SSID
3. Check if your wireless adapter can obtain IP automatically
To obtain the IPv4 IP settings automatically, click Obtain an IP address automatically.
Click OK when it's done.

4. Confirm if it can successfully access to Internet via wired connection

5. Check whether the wireless LED of router is lighting normally or not
6. Check whether you enabled the Radio function
7. Check whether the other wireless devices have the same symptom/issue.
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WiFi signal is often disconnected
1. Please make sure the firmware of router is the latest one.
2. You can swtich to control channels with less interference.

3. Please make sure no disturbances around router which could impact wireless signals
Ex: Microwave, cordless phone, power box…etc.
4. Please make sure no resistance around router which could impact wireless signals
Ex: Iron cabinet, iron door, Concrete walls, sealed cabinet. Put router on the ground or behind
sofa…etc.
5. Please try to place your router at other location
Ex：You can put router on the wood cabinet, on the table, center of your house or closer to the
weakest WiFi signal point
2. LED anomaly：

Power LED flashing
Please follow below steps to operate Rescue mode to fix this problem
(1) Download and install utility
Go to ASUS global website and key in model name
1. Click [Support]
2. Click [Driver & Tools]
3. Select OS
4. Select [Utilities]
5. Find ASUS Rescue mode utility
6. Click [Global] to download

ZIP file will be saved to indicated location
Find ZIP file and unzip it.
Double click to install.
(2) Change the setting of adapter
1. Connect computer to router via wired connection
2. Click [ Start ]→ [ Control Panel ]→ [ Network and Internet ]→ [ Network Connections
]→Click[Change adapter settings ]→ [LAN ]→ Right click [ Properties ]→ Click [Internet
protocol version4(TCP/IPv4) ]→ Click [ Properties ] on the right
3. Revise your setting as below
IP address：192.168.1.10
Subnet mask：255.255.255.0
Click [OK]

(3) Upload firmware
1. Unplug the wireless router from the power source.
2. Hold the [Reset button] for around 5secs, meanwhile; re-pug the wireless router into the power
source
3. Release the Reset button when the [Power LED] at the front panel start flashing, which
indicates that wireless router is in the Rescue Mode
4. [Start ]→ [All programs ]→[ASUS utility ]→ [RT-AC87UWireless Router ](Depends on
different model name)→「Firmware Restoration」
5. Enter [Firmware Restoration], click [Browse] to choose the firmware you want to upload, then
click [Upload] and wait around 60secs.

6. When [Power LED] keeps stable lighting ,you can press [Reset button ] to restore it to default
setting
Note: After executing Rescue mode, please go to [Start]→ [Control Panel]→ [Network and
Internet]→ [Network Connections]→Click[Change adapter settings]→ [LAN ]→ Right click
[Properties] → Click [Internet protocol version4(TCP/IPv4)]→ Click [Properties] on the right,
change your setting of IPv4 to [Obtain an IP address automatically]
WiFi LED light is not on
1. Please check if you turn on the WiFi switch of router

2. Check if you enabled the Radio function on setting page
3. Please make sure the router firmware is the latest one.
4. Restore router to default setting
There is a reset button at the back of router. When device is energized, press Reset button
(around 5 secs) until Power LED start flashing then release reset button.
※Notice：If router is restored to default then you need to reset your information

Abnormal WAN LED
1. Please make sure the firmware of router is the latest one.
2. Please confirm that your router has correct WAN connection.(refer to below)

3. Please confirm with your ISP that your network cable is normal
3. Internet access abnormal：
(1) Failed accessing to internet through router
Failed access to Internet through router
1. Please confirm your router has correct WAN connection.(refer to below)

2. Please make sure your adapter is set to obtain IP automatically.

3. Confirm that your computer can access to Internet through other network environment
4. Please confirm your ISP Internet settings and related information
Remark：It is recommended to survey what kind of ISP providers in each country and
information about how to access to Internet by each ISP to help user complete setting.
Ex：Taiwan - Chunghwa Telecom
Internet connection type：PPPoE / Static IP
Notice：PPPoE account is 8 numerical [e-mail]
5. Please check your computer can connect to Internet via the network cable provided by ISP
6. Please confirm that router has the latest firmware version.

7. Restore your router to default setting
The Reset button is at the back of router. When device is energized, press Reset button (around
5 secs) until Power LED start flashing then release Reset button for its reboot.
※Notice：If router is restored to default ststus, then you need to reset your information
8. Finish your setting through QIS

4. USB-connected devices cannot be used:
(1) Cannot use USB printer
(2) USB HDD cannot be searched
(3) Cannot use 3G/4G adapter
(4) Cannot use smart phone to share internet through router
My USB printer won't connect
1. Please go to compatibility list for printer server on Global website and check if router
supports user's printer model
Printer Support List：https://www.asus.com/event/network/Printer_Server/
2. Please confirm router has the latest firmware version
3. Please check you have completed and operated printer utility normally.
You can refer to “EZ printer sharing” on Global website or on ASUSWRT（Only for
Windows OS）FAQ
4. Try to set up printer by LPR protocol.
For Windows OS, use LPR protocol to share printing FAQ
For MAC OS, use LPR protocol to share printing FAQ

USB HDD cannot be searched
1. Please go to “Plug-n-Share Disk Support List”on global website to check if user's USB HDD
disk format and partition size is supported.
Plug-n-Share Disk Support List：
http://event.asus.com/2009/networks/disksupport/?_ga=1.43556709.1717103240.1398267030
2. Please make sure router has the newest firmware
3. Please plug HDD to computer to see if it can normally use.
4. Try other HDD to connect router to see if it can work normally
5. Please ask user to back up if HDD has important data
6. Format HDD to NTFS format then plug into wireless router to test again