When I bought my STK2M3W64CC it worked fine. I haven't used it for some time and I don't clearly remember if the wireless network problem started after some update or not.
Anyway, I have tried a lot of things (https://answers.microsoft.com/en-us/windows/forum/all/intel-dual-band-wireless-ac-8260-not-working-on/30f14f66-dcca-40f0-b34b-70b5c4484b0a, https://superuser.com/questions/1189087/solve-wifi-problems-with-windows-10).
I have upgraded my Windows 10 Home 64 bits to version 1803, then to version 1809, have updated the BIOS version to 0058, have updated every Intel driver (https://www.intel.com/content/www/us/en/support/intel-driver-support-assistant.html shows everything is updated) and still nothing.
I tried network resets, I uninstalled Intel Proset / Wireless tools and only installed the bare Intel drivers.
I tried to manually add the network adapter as a legacy hardware and tried every Intel wireless driver that came with the "WiFi_20.120.1_Driver64_Win10.zip" file, but the hardware on the Device Manager showed an exclamation mark and accused error 31: "This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)"... Maybe I have witnessed some error 10 also: "This device cannot start. Try upgrading the device drivers for this device. (Code 10)", but error 31 was the most frequent one and on both errors, Microsoft proposed solution is to update the drivers, but it didn't solve the problem.
Latest Intel wireless driver is 18.104.22.168, service name Netwtw06 from 31.12.2018.
I started to suspect it wasn't an OS related issue, nearly tried to boot an Ubuntu pendrive to confirm that, but was a little bit lazy and started to search for the same problem on Intel Compute Sticks with Ubuntu. I saw some comments on cold boot versus restart and some issues related to network speed (not my problem) when resuming from idle states...
My Windows Power Management configuration for the wireless network adapter was set to "Maximum Performance".
So I went to the BIOS, tried to disable and re-enable the wireless LAN and still nothing.
What finally solved my problem: Changing the BIOS setting "Power State" from "Always On" (system will auto power-on when power adapter is connected - and when you ask Windows to shut it down, there is a blue LED continuously lit) to "Always Off" (system will NOT auto power-on when power adapter is connected - no LED lit when Windows shuts down). Thank God! I rebooted it and things are still working properly!
It seems to be some real odd bug related to the power state of the Intel Compute Stick or the Intel AC 8260 when not completely turning / powering off and powering on again.
Hope you are doing fine!
Thank you for trying to help me.
It didn't work out.
My Intel AC 8260 wireless adapter seems completely dead. Windows just don't recognize it.
Besides the wireless adapter (Intel AC 8260), my Intel Compute Stick m3 is running fine already with BIOS 0058. Why should I update it with the same BIOS?
The BIOS recovery procedure you sent seems to only apply to the NUC, not to the Compute Stick.
I have some questions:
1) Did anyone from Intel reviewed my SSU report that I uploaded?
2) If they did, didn't they find anything strange that would leed to better troubleshooting?
3) Does Intel have any troubleshooting software that I could run to test my Compute Stick, with detailed reporting?
I have already loaded BIOS defaults.
Windows does not even show it under "Network Adapters".
I am uploading the SSU report. I did it when I opened the support ticket, but I guess it just might be a different system. One thing that may give you some hint on the problem is that the wireless adapter is reported as "PNP Device ID:"ROOT\UNKNOWN\0000".