[FS#4159] hostapd-common update breaks WiFi completely when using the config file for the previous version

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FS#4159 - hostapd-common update breaks WiFi completely when using the config file for the previous version
User who did this - Harry Martin (systemdlete)

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Starting with the 19.07.8 image, and then proceeding the same as my last post, I am able to get slightly farther.  At least I don't seem to lose the wlan0 device entirely.  I can install hostapd-common, and even install, say, hostapd and configure it, etc.   Now I can run scans repeatedly without the complete loss of the wireless.  I can see all of my neighbors' APs both before and after changes to the router (as I make configuration changes).

The problem is I can't seem to get the radio to start.  The wireless page in LuCI always shows "Device is not active" -- even though I can successfully scan.  Restart does nothing to change that state.

So downgrading appears to allow scanning to work persistently, although after some time, I find I need to cold start the router as reboots no longer restore the running state of the VM to where it was when I could still run scans.  Hopefully this update post might give someone here an idea for me to try.   Meanwhile, I continue my rubber duck debugging as best as I can.  (I'm also working on building a custom image so I can eventually do some debugging.)
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4159#comment10465

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