Hello!
I can confirm - there is no firmware being uploaded to the device, or at least: 
if it's there, it's not uploaded from an external file.
root@smalltalk:~# ls -Fa -1 /lib/firmware/
./
../
regulatory.db
root@smalltalk:~#

Anything I might do? I can also give an ssh session to the device in case.

Enrico

On Tue, 23 Jan 2018, Stanislaw Gruszka wrote:

Date: Tue, 23 Jan 2018 14:22:35
From: Stanislaw Gruszka <[email protected]>
To: Enrico Mioso <[email protected]>
Cc: Tom Psyborg <[email protected]>,
    linux-wireless <[email protected]>,
    Johannes Berg <[email protected]>,
    Daniel Golle <[email protected]>, Arnd Bergmann <[email protected]>,
    John Crispin <[email protected]>, Felix Fietkau <[email protected]>
Subject: Re: ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping
    frame due to full tx queue...?

On Mon, Jan 22, 2018 at 06:45:57AM +0100, Enrico Mioso wrote:
Crash happening here also in the WL-330n3G device; unfortunately, no messages 
to report.
Regarding your hypothesis regardingthe firmware not being able to communicate a 
problem regarding it's inability to send frames: around when OpenWRT had 3.9.9 
kernel, this device worked for weeks no stop with no issues I think.
And I don't think this is only a coicnidence. So I suspect, but it's only an 
impression, also because I know ... very very little about this, that at some 
point things worked.

I think FW was upgraded since 3.9 kernel as well. But this
could be also problem how driver program the device registers,
not only FW problem.

Regards
Stanislaw

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