Kasa and Tapo Setup Failures: 2.4 GHz, Split Bands, Resets, Firmware and Matter
TP-Link sells two smart home lines: Kasa and Tapo. When a Kasa or Tapo plug, bulb or switch fails during setup, the cause is usually the same short list: a 5 GHz-only or combined-band Wi-Fi network, a router setting the device does not like, a device that is not in setup mode, old firmware, or a Matter pairing step done out of order. This guide works through each one. Every step comes from TP-Link’s official Kasa and Tapo support pages, linked throughout so you can check the details for your model.
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Quick answers
- Your phone and the plug need 2.4 GHz. The Tapo smart plug FAQ says the device does not support 5 GHz.
- One Wi-Fi name for both bands? Give 5 GHz its own network name, or turn 5 GHz off during setup.
- Still won’t join Wi-Fi? Set the router’s 2.4 GHz band to WPA2 (WPA2+AES), channel 1, 6 or 11, and 20 MHz width.
- Device not found? Put it back in setup mode: hold the button about 5 seconds (soft reset) or about 10 seconds (factory reset).
- Firmware: update in the app only, and keep the device powered during the update.
- Matter: set up in the Kasa or Tapo app first, then add it to Apple Home, Google Home, Alexa or SmartThings within the 15-minute window.
Before you start: the right app and the right model
TP-Link’s Kasa setup troubleshooting FAQ says to select the correct model number during setup. Check the label on the device or the box. TP-Link’s Tapo FAQ also says to choose Bluetooth Setup for the Tapo P110 (US), Tapo P115 (US) and Kasa EP25 hardware version 2.6, and Wi-Fi Setup for other versions of those models. If you are adding several devices, TP-Link suggests powering on one at a time. Before each attempt:
- Update the Kasa or Tapo app, your phone’s software and your router’s firmware.
- Turn off any VPN or VPN-style app on the phone (TP-Link names Lookout and AdGuard as examples).
- On an iPhone or iPad, go to Settings, find the Kasa or Tapo app and turn on Local Network.
- Keep the phone and the device close to the router.
Still deciding between the two lines? See Kasa vs Tapo.
Step 1: Use 2.4 GHz and separate (split) band names
Most setup failures start here. TP-Link’s Tapo smart plug setup FAQ says to make sure your home Wi-Fi is on 2.4 GHz because the Tapo device does not support 5 GHz. The HomeKit-supported Kasa setup FAQ adds that your phone should be connected to the router’s 2.4 GHz Wi-Fi during setup.
Many routers and mesh systems use one network name for both bands (often called band steering or Smart Connect). TP-Link’s Kasa FAQ suggests these fixes, in order:
- Split the bands. Give the 5 GHz band a different network name (SSID) from the 2.4 GHz band. Connect your phone to the 2.4 GHz name, then run setup.
- Or turn off 5 GHz temporarily. Switch it back on once the device is set up.
- If 5 GHz cannot be turned off, move the router and the smart device farther apart. TP-Link notes that 2.4 GHz usually reaches farther than 5 GHz, which encourages the device to pick it.
Not sure how to do this on your router? Our Wi-Fi keeps disconnecting guide and the brand guides for TP-Link Deco and eero cover band and network settings.
Step 2: Check router settings TP-Link recommends
From TP-Link’s Kasa and Tapo setup FAQs. Change one setting at a time, then retry setup.
| Setting | What TP-Link recommends |
|---|---|
| Band | 2.4 GHz enabled and visible; phone connected to it |
| Encryption | WPA2. The Kasa FAQ specifies WPA2+AES |
| Channel | A fixed channel: 1, 6 or 11 |
| Channel width | 20 MHz |
| Network type | Not an open network and not a captive portal (a sign-in page like hotel Wi-Fi). TP-Link smart home devices do not support either |
| Password | Kasa: no more than 64 characters and no single or double quotes. Forget the network on your phone and rejoin it to confirm the password |
| Hidden network | In the Tapo app, choose Other Network and enter the name and password by hand |
| Device limit | Tapo: make sure the router, especially a guest network, has not reached its maximum number of devices |
| Firewall | Tapo: temporarily disable router firewalls if pairing fails |
| Connected but Local Only | Tapo: change the router’s DNS to 8.8.8.8 and 8.8.4.4. Kasa gives the same DNS advice and suggests asking about AP or client isolation |
TP-Link’s Tapo FAQ also suggests a test: connect the device to a phone’s mobile hotspot. If it works, update the device’s firmware in the app, reset it, and try your router again.
Step 3: Fix the error the app shows
From TP-Link’s Kasa setup troubleshooting FAQ and Tapo smart plug setup FAQ.
| App message | What TP-Link says to do |
|---|---|
| Kasa: “Connect to Wi-Fi” or “No Internet” | Confirm your phone is on your home Wi-Fi and online. Force-close the Kasa app, reopen it and wait a few seconds. |
| Kasa: “Unable to Connect to Your Smart Device’s Wi-Fi” | Check the device is in setup mode (plugs and switches: LED blinking orange and green; bulbs: flash three times). In phone Settings, join the device’s network (TP-Link_Smart Plug_XXXX or TP-Link_Smart Bulb_XXXX), then tap Try Again. Turn on Local Network on iPhone, turn off VPNs, and forget remembered networks the phone keeps switching to. |
| Kasa: “Unable to Find Your Device” | The app cannot find the device over Bluetooth. Check the model, power cycle the device, move the phone closer, turn Bluetooth off and on, then reset the device and restart the phone if needed. |
| Kasa: “Unable to Connect to Your Wi-Fi Network” | Wait 15 seconds. If a plug’s Wi-Fi LED is solid green or blue, it is connected: do not tap Restart Setup; force-close and reopen the app. Otherwise check signal and password, then apply the Step 1 and Step 2 router settings. |
| Tapo: “Unable to find this Tapo device” | Choose the correct model and setup method, update the app, phone and router, power on one device at a time, factory reset if the LED looks abnormal, or try another phone. |
| Tapo: can’t find your home Wi-Fi | Move closer, make sure the network is 2.4 GHz, tap Rescan, or use Other Network to type it in. Apply the Step 2 settings. |
| Tapo: “Unable to Connect to Your Network” | Check the password, reboot the router and device, update router firmware and check the router’s device limit. |
| Tapo: “Pairing Failed” | Check the password and signal, apply the Step 2 settings, try a mobile hotspot, disable router firewalls temporarily, and change DNS if the device shows Local Only. |
If the Kasa app cannot save the device name or icon, TP-Link suggests a simple name and an icon from the app rather than your photo library.
Step 4: Reset the device the right way
A reset puts the device back into setup mode. TP-Link describes two kinds: a soft reset keeps your settings, and a factory reset erases everything so you set the device up as new. From TP-Link’s Kasa plug and switch reset FAQ, Tapo and Kasa plug reset FAQ and Kasa bulb reset FAQ.
| Device | Soft reset (keeps settings) | Factory reset (erases settings) |
|---|---|---|
| Kasa smart plug or switch | Hold the reset button 5 seconds until the Wi-Fi LED blinks amber and green (HS105: amber and blue) | Hold about 10 seconds until the LED blinks amber rapidly |
| Kasa HS300 or KP303 power strip | Hold the control button 5 seconds | Hold the control button 10 seconds |
| Tapo or Kasa smart plug (Tapo FAQ) | Hold the power button 5 seconds | Hold the power button 10 seconds, or remove the plug in the app while it is online |
| Older Kasa bulbs (LB130, KL110 1.0, KL120 and similar) | With the wall switch off, flip it on and off 3 times | Flip it on and off 5 times |
| Newer Kasa bulbs (KL50, KL125, KL135 1.0 and similar) | Flip the switch on and off 5 times | Flip it on and off 10 times |
| Kasa light strips (KL400, KL420, KL430) | Hold the controller 5 to 10 seconds | Hold the controller 10 seconds or more |
| TP-Link Matter devices | Not listed | Hold the reset button at least 10 seconds (on plugs, the power button). Bulbs: power cycle 3 times for Tapo or 5 times for Kasa, one second apart, until the bulb blinks three times |
TP-Link says to flip bulb switches at about one-second intervals, not faster. The HomeKit-supported Kasa FAQ notes that a device left in setup mode for 10 minutes goes to sleep and needs another reboot or reset. If your plug is offline, the button is the only way to factory reset it; app-based removal needs the device online.
Step 5: Update firmware
From TP-Link’s firmware update FAQ and firmware update failure FAQ. TP-Link says Tapo and Kasa firmware is updated through the app, not a web browser or a manual file.
- Sign in to the app and make sure you can control the device.
- Open the device, tap the gear icon and tap Firmware Update. In the Tapo app you can also go to Me > Firmware Update.
- Turn on Auto Update if your model offers it.
- Do not power off the device during the update.
If an update fails: power cycle the router and the device, move the device closer to the router, or connect it to your phone’s hotspot and try again. TP-Link releases updates gradually, so two devices of the same model may not see a new version at the same time. The rollout typically takes a few weeks to a month.
Step 6: Matter versions and Matter pairing
Not every Kasa or Tapo device supports Matter. TP-Link’s Matter features by platform FAQ lists its Matter-certified models, including these plugs and switches:
- Kasa: KP125M (and KP125MP2/KP125MP4 packs), EP40M outdoor plug, KS205 and KS225 switches, KS240.
- Tapo: P100M, P110M, P125M, P116M, P316M, P400M and P306 plugs and strips, S505 and S505D switches.
Other models in the same family are a separate version. TP-Link’s HomeKit-supported Kasa setup FAQ covers the KP125 and EP25, which set up through the Kasa app and connect to Apple Home over HomeKit instead. If you want one plug that works across Apple Home, Google Home, Alexa and SmartThings through Matter, check that the exact model number on the box is on TP-Link’s Matter list. TP-Link’s Tapo H500 Matter FAQ explains that a Tapo H500 hub can act as a Matter bridge for some non-Matter Tapo sub-1G devices, such as T100, T310, T315 and S220 sensors and buttons.
How to pair a Matter model
From TP-Link’s Matter setup guide and Matter troubleshooting FAQ.
- Set it up in the Kasa or Tapo app first. TP-Link strongly recommends this: the app installs the latest firmware, which can fix known compatibility issues.
- Find the Matter setup code. It is printed on the side of a plug and on a backup sticker in the box. In the app, open the device, tap the gear icon, then Device Info > Matter Setup Code.
- Add it to your platform within 15 minutes of the device powering on. If the window has passed, power cycle the device.
- Keep the pairing code screen open while you scan or type the code in the other app.
- Use one network. TP-Link calls this the most important part: the Matter controller and the plug must be on the same local network, not a guest, IoT or VLAN network.
TP-Link adds that Bluetooth must be on, with permission given to the third-party app. Do not create pairing codes in several apps in a row: if the first code is unused or unexpired, later codes are invalid. Some controllers on a 5 GHz-only network pass those details to the plug, which only supports 2.4 GHz; if so, set it up in the Kasa or Tapo app first. Removing a Matter device from the Kasa or Tapo app factory resets it, and it then shows as unresponsive in other apps.
What works on each platform
TP-Link’s Matter features FAQ says firmware updates and local control through Matter work in Alexa and Apple Home but are not listed for Google or SmartThings. Energy monitoring, power protection, LED control and Away mode need the Kasa or Tapo app (SmartThings supports energy monitoring after a reset). Need a Matter controller? See our Matter hubs guide and Matter vs Thread explained.
If the device keeps going offline after setup
TP-Link’s Kasa offline FAQ starts with rebooting the router and the device, then checking signal strength in the Kasa app (Device Settings > Device Info, then the Wi-Fi icon). TP-Link calls stronger than -50 dBm strong, -50 to -70 dBm good to average, and weaker than -70 dBm poor enough to cause disconnects. Move the device or the router if the signal is poor, or test on another router’s 2.4 GHz network or a hotspot to see whether the router is the cause. For coverage problems, see how to fix Wi-Fi dead zones.
Gear worth considering
These TP-Link plugs were in stock as new items sold by Amazon.com when we checked on October 23, 2026. We have not tested them; the notes below come from TP-Link’s own model and compatibility pages.
Kasa KP125M Matter smart plug (2-pack)
A Matter-certified Kasa plug with energy monitoring. TP-Link lists the KP125M among its Matter-certified models, so it can be added to Apple Home, Google Home, Alexa or SmartThings with the Matter code.
View the Kasa KP125M 2-pack on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
Tapo P125M Matter smart plug
A compact Tapo plug that TP-Link lists as Matter-certified, for people who prefer the Tapo app.
View the Tapo P125M on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
Kasa Smart Plug Mini EP25 (4-pack)
A non-Matter Kasa plug that TP-Link lists with Apple HomeKit support, plus Alexa and Google Assistant through the Kasa app. Remember the 2.4 GHz rule above during setup.
View the Kasa EP25P4 4-pack on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
For more options, see Best Matter smart plugs, our smart plug buying guide and do smart plugs need a hub?
Frequently asked questions
Do Kasa and Tapo smart plugs work on 5 GHz Wi-Fi?
No for the plugs covered here. TP-Link’s Tapo smart plug setup FAQ says the Tapo device does not support 5 GHz, so your home network must offer 2.4 GHz. TP-Link’s Kasa setup FAQ also points you to the 2.4 GHz band when a device will not join your Wi-Fi.
My router uses one Wi-Fi name for 2.4 GHz and 5 GHz. What should I do?
TP-Link suggests giving the 5 GHz band a different network name (SSID) from the 2.4 GHz band, or temporarily turning off 5 GHz during setup. If you cannot turn 5 GHz off, TP-Link suggests moving the router and the smart device farther apart so the device prefers the longer-range 2.4 GHz band.
Which router settings does TP-Link recommend when setup fails?
WPA2 (Kasa specifies WPA2+AES) encryption, a fixed 2.4 GHz channel of 1, 6 or 11, and a 20 MHz channel width. TP-Link smart home devices do not support open Wi-Fi networks or captive portals like hotel Wi-Fi.
What is the difference between a soft reset and a factory reset?
For Kasa and Tapo smart plugs, TP-Link says holding the button for about 5 seconds is a soft reset that keeps your settings and puts the device back into setup mode, and holding it for about 10 seconds is a factory reset that erases all settings. After a factory reset, you add the device again as if it were new.
How do I update Kasa or Tapo firmware?
TP-Link says Tapo and Kasa device firmware is updated through the app, not a web browser. In the Tapo app, open the device, tap the gear icon and choose Firmware Update, or go to Me > Firmware Update. Do not power the device off during an update.
Can I add a Kasa or Tapo plug to Apple Home, Google Home or Alexa with Matter?
Only Matter-certified models, such as the Kasa KP125M or Tapo P125M. TP-Link recommends setting the device up in the Tapo or Kasa app first, which also updates its firmware, and then adding it to the other platform with its Matter setup code.
Why does Matter pairing keep failing?
TP-Link lists several causes: the 15-minute Matter setup window has expired (power cycle the device to reset it), several pairing codes were created in a row so the later ones are invalid, the pairing code screen was closed, or the controller and the plug are on different networks such as a guest, IoT or VLAN network.