Help Us with the Wi-Fi Issue of Firmware 3.6.0

tadawson · February 5, 2026, 4:18am

For those seeing random drops, would you please also note the signal strength (RSSI) your unit reports?

IPMI · February 6, 2026, 11:44am

Hullo everyone,

I likewise created this new account in order to post some info in the hope that it helps troubleshooting.
I have 2 monitors (indoor and outdoor) but only the outdoor one has a problem. As I type this, both my devices have downgraded to 3.4.1.

Anyways here goes:

Model number of the monitor that has the issue? (I-9PSL-DE, O-1PST, etc.).
My O-1PST has this issue.
Symptoms:
I get circa 9 hours of operation then the system vanishes from the LAN. ICMP pings are unanswered (On MacOS: “ping: sendto: No route to host”). HomeAssistant reports loss of data as does the AirGradient dashboard.
What does the OLED screen of the monitor show when it is disconnected? N/A
Network setup: “flat” network topology, no VLAN’s, DNS and firewall are all wired, IPv4 only.
AirGradient monitor configuration:
Here is the affected O-1PST:

{
  "country": "GB",
  "pmStandard": "ugm3",
  "ledBarMode": "co2",
  "abcDays": 8,
  "tvocLearningOffset": 12,
  "noxLearningOffset": 12,
  "mqttBrokerUrl": "",
  "temperatureUnit": "c",
  "configurationControl": "local",
  "postDataToAirGradient": true,
  "ledBarBrightness": 100,
  "displayBrightness": 100,
  "offlineMode": false,
  "monitorDisplayCompensatedValues": false,
  "httpDomain": "",
  "disableCloudConnection": false,
  "model": "O-1PST",
  "corrections": {
    "atmp": {
      "correctionAlgorithm": "ag_pms5003t_2024",
      "slr": null
    },
    "rhum": {
      "correctionAlgorithm": "ag_pms5003t_2024",
      "slr": null
    }
  },
  "extendedPmMeasures": false
}

And for comparison here is the I-9PSL-D which remains NOT affected:

  "country": "GB",
  "pmStandard": "ugm3",
  "ledBarMode": "co2",
  "abcDays": 8,
  "tvocLearningOffset": 12,
  "noxLearningOffset": 12,
  "mqttBrokerUrl": "",
  "temperatureUnit": "c",
  "configurationControl": "local",
  "postDataToAirGradient": true,
  "ledBarBrightness": 100,
  "displayBrightness": 53,
  "offlineMode": false,
  "model": "I-9PSL-DE",
  "monitorDisplayCompensatedValues": false,
  "disableCloudConnection": false,
  "httpDomain": "",
  "extendedPmMeasures": false
}

Is your Wi-Fi network using a unified band (a combined Wi-Fi name without separating 5GHz and 2.4GHz)?
Both!

The affected outdoor monitor O-1PST is on a dedicated AP for garden IOT presenting a unique SSID over 2.4GHz only.
However, the functioning indoor monitor I-9PSL-DE is on a unified band (5GHz+2.4GHz) on a different SSID.

Is your Wi-Fi a mesh system, have multiple access points, or use Wi-Fi extender?
Multiple access points, each GbE backhauled for data+POE.
Do you have your Wi-Fi DHCP server configured to assign a static IP address for connected devices?
Yes.
Does the monitor connect to Home Assistant or other platforms?
Yes but the AirGradient cloud dashboard is used for configuration.
Is this Wi-Fi issue gone after you downgrade your AirGradient monitor from firmware 3.6.0 to 3.4.1?
No.
However the O-1PST downgraded itself to firmware 3.4.1 yesterday AM after a power cycle. It was functioning ok that day until it lost the connection again at 2000GMT only to re-appear at 0705GMT without any action on my part (Cloud and HA).
The I-9PSL-DE has remained online with both firmwares (again, visible in Cloud and HA).

EDIT to add RSSI values thus:
I-9PSL-DE RSSI = -62dBm
O-1PST RSSI = -68dBm

HTH !

Kind regards from the UK,

IPMI

Tai_AirGradient · February 6, 2026, 2:18pm

@tadawson Many thanks for your update!

Hi @Smith6612 and @IPMI, would you mind letting us know your Place ID via support as mentioned in Help Us with the Wi-Fi Issue of Firmware 3.6.0 - #26 by Tai_AirGradient ?

I can enable your place for FW 3.6.2 if you would like to test whether it fixes the issue.

Thanks!

IPMI · February 6, 2026, 3:30pm

Support form submitted and yes please, happy to try Firmware 3.6.2.

Cheers!

IPMI

uncle_t · February 7, 2026, 3:15am

I use separate 2.4ghz set to 20mhz bandwidth. always use channels 1,6 or 11 depending on neighbors.

mine disconnected today.

I wanted to assign a static DHCP and see several unknown devices in my router. how can I find the MAC address of the meter?

Zenit · February 7, 2026, 5:41am

Hi Tai,
support ticket is submitted, please add my device to the list for 3.6.2.
Kind regards

tadawson · February 7, 2026, 5:44am

If you have the dashboard configured - bring up the “Show monitor information” window. The device serial is the MAC.

Tai_AirGradient · February 7, 2026, 9:10am

Hi everyone,

@IPMI @Zenit I have configured your place to receive 3.6.2. I’d greatly appreciate it if you can provide us with your feedback after the monitor is updated to the new firmware.

@uncle_t You can find the MAC address in the monitor’s serial number as @tadawson mentioned. And if you don’t mind, please feel free to reach out to us via support as I mentioned above. I’m happy to enable for your Place ID to get 3.6.2 if you would like to test it.

@tadawson Thank you so much again for providing the info for our friends in the community.

And I’d like to say thank you a lot again for everyone here who help providing your valuable information to help us fix the issue. Especially those who enrolled for testing the FW 3.6.2.

Please feel free to let me know your feedback on the FW 3.6.2.

If it works well for most users, I will bring this up to our team, so we can roll out the new firmware globally.

Thanks and hope you’ll have a nice weekend guys!

IPMI · February 7, 2026, 11:48am

@Tai_AirGradient I’m afraid regarding my O-1PST the issue was a “PEBKAC”: in my paranoia I had set that particular outdoor SSID on a timed On/Off shedule! So the monitor “disappearing” was quite natural I’m afraid.

I’m happy to retain both monitors on 3.6.2 and see what happens.

Sorry for the false data point

IPMI

gianfranco.bottini · February 7, 2026, 4:06pm

Both my monitors are on 3.6.2 and everything is fine, last week the Wi-Fi disconnection issue didn’t happen anymore.

Thank you and have a nice weekend!

Smith6612 · February 8, 2026, 6:09pm

Hi there! I just submitted the support ticket. The monitor which dropped offline the last time has dropped offline again.

Here’s some more information to help.

1: Model is the AirGradient ONE. Note that I have 3x AirGradient ONE Devices and 1x AirGradient Open Air devices on the same network and in the same location. Only one device is experiencing issues.

2 and 3: OLED Screen shows Wi-Fi is disconnected. The left-most LED is lit solid red. My UniFi Network reports the monitor is simply dropping off of the Wi-Fi. The monitor itself continues to report and measure data locally via the Screen and LEDs.

4: My Network uses Ubiquiti UniFi UXG-Pro (Gateway), a USW-Enterprise-24 PoE Switch, has 3x U6-Enterprise-IW and 1x U6-Enterprise Access Points.

5: Here’s the configuration of a monitor which is working, and a monitor which is dropping offline:

Malfunctioning Monitor

country	"US"
pmStandard	"us-aqi"
ledBarMode	"co2"
abcDays	180
tvocLearningOffset	12
noxLearningOffset	12
mqttBrokerUrl	""
temperatureUnit	"f"
configurationControl	"local"
postDataToAirGradient	true
ledBarBrightness	100
displayBrightness	100
offlineMode	false
monitorDisplayCompensatedValues	false
disableCloudConnection	false
model	"I-9PSL-DE"
httpDomain	""
extendedPmMeasures	false

Good Monitor:

	
country	"TH"
pmStandard	"us-aqi"
ledBarMode	"co2"
abcDays	180
tvocLearningOffset	12
noxLearningOffset	12
mqttBrokerUrl	""
temperatureUnit	"f"
configurationControl	"local"
postDataToAirGradient	true
ledBarBrightness	100
displayBrightness	100
offlineMode	false
monitorDisplayCompensatedValues	false
disableCloudConnection	false
httpDomain	""
extendedPmMeasures	false

For safe measure, here is a third monitor which is also working properly:

	
country	"US"
pmStandard	"us-aqi"
ledBarMode	"co2"
abcDays	180
tvocLearningOffset	12
noxLearningOffset	12
mqttBrokerUrl	""
temperatureUnit	"f"
configurationControl	"local"
postDataToAirGradient	true
ledBarBrightness	100
displayBrightness	100
offlineMode	false
monitorDisplayCompensatedValues	false
disableCloudConnection	false
model	"I-9PSL-DE"
httpDomain	""
extendedPmMeasures	false

Curiously, one of the “Good” monitors reports Thailand as the Country/Region rather than United States. I’m in the United States.

6: My network broadcasts two separate SSIDs, a 2.4/5Ghz combined network on WPA2, and a WPA3-SAE network broadcasting on 2.4Ghz, 5Ghz, and 6Ghz. The monitors are connecting to the WPA3-SAE Network.

7: Four access points, which are all hardwired to the network. No wireless meshing is in use. However I run protocols such as WPA3-SAE Fast Roaming, and 802.11R/802.11K/802.11V on the access points.

The wireless signal for my monitors ranges from -49dB to -60dB. The problematic monitor will have a different RSSI depending on which access point it selects.

8: Everything is DHCP for the monitors.

9: Yes

10: Yes. Home Assistant

11: Did not try a downgrade. Let’s try the latest firmware.

Tai_AirGradient · February 8, 2026, 6:23pm

Hi guys! Hope you all had a great weekend.

@IPMI Please don’t worry at all! If you need any help, please just let me know.

@gianfranco.bottini Many thanks for the feedback. I feel encouraged to hear it. Looks like we will be able to roll out the new firmware globally soon!

@Smith6612 All set! No actions needed on your side. You should get the new firmware in a few hours. Or you can force the monitors to detect the new firmware quickly by just power cycling them. Feel free to reach out to me if there’s any issue.

Thank you everyone.

Smith6612 · February 8, 2026, 7:05pm

Thank you! I can confirm my Monitors have started downloading the new firmware. 3/4 are updated. All are online.

EDIT: All have updated and are online.

markmcb · February 9, 2026, 3:03am

I’m having the same issue with 3.6.0 however no amount of rebooting or erasing and reconfiguring wifi helps get it back online. Can you send me the firmware for a manual update?

Tai_AirGradient · February 9, 2026, 3:05am

@Smith6612 Thanks for the update!

@markmcb Sure! Could you please reach out to me via https://www.airgradient.com/support ? Thank you.

Rev · February 9, 2026, 7:57am

+1 for the connection issues here.,
Plus other issues, but Ethan is trying to help me via email support.

I just wait for the official rollout.

luckman212 · February 12, 2026, 2:07pm

Hi today my Unifi wifi access point restarted for a firmware update and so was offline for about 4 minutes. My AirGradient One I-9PSL-DE did not auto-reconnect. Stayed offline with red LED lit. I had to power cycle the unit.

It has firmware 3.6.0, serial# is 34b7dabd4c50 - can I please try the 3.6.2 or whatever firmware may fix this issue please?

Tai_AirGradient · February 12, 2026, 3:21pm

Hi @Rev, thank you. We have started rolling out the 3.6.2. Some places might receive the update earlier or later. Please hang it there!

Hi @luckman212, I have set your place to get the 3.6.2. You can expect your monitor to be updated in a few hours. Alternatively, you can try power cycling (unplugging and plugging in) your monitor to force it detect the new firmware quickly.

Note: You might see the firmware dropdown selector blank, and the ‘Always update to the latest stable version’ unchecked. But please don’t worry, you don’t have to do anything, as the 3.6.2 is currently only visible to us at AirGradient. Users will see it as soon as we have it globally released.

Thank you all!

luckman212 · February 12, 2026, 3:33pm

@Tai_AirGradient Thank you. I see my monitor already upgraded to 3.6.2. I will re-test it now.

update: good news, it seems to fix the issue where the unit would not re-connect after briefly losing the WiFi connection (e.g. for AP reboots).

Tai_AirGradient · February 12, 2026, 3:35pm

@luckman212 That’s quick! Thank you a lot.

Please feel free to let me know if you experience any issues on the new firmware.