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 <redacted>
To: Enrico Mioso <redacted>
Cc: Tom Psyborg <redacted>,
    linux-wireless [off-list ref],
    Johannes Berg [off-list ref],
    Daniel Golle [off-list ref], Arnd Bergmann [off-list ref],
    John Crispin [off-list ref], Felix Fietkau [off-list ref]
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:

quoted

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