Inaccessible SMAKN/CJMCU Beetle Leonardo

Other Hardware 3rd Party Boards
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Hi. How do you program a "SMAKN/CJMCU Beetle" Arduino, which allegedly is just a smaller form factor of the Leonardo?

I'm unable to program it, as it's not appearing as a USB device under Ubuntu. I was able to program this board several years ago, so I know it's possible, but clearly something's changed.

I bought 5 of these, and I've tried three, and all are now inaccessible under USB. However, the default "blink" program is running on all of them, and when connected to USB, they power on and blink their LEDs, so they're definitely working to some extent. Yet nothing appears under lsusb or the Arduino IDE.

From my old notes, I encountered a similiar error last time, but the solution was mentioned in this question of purging nodemanager with:

sudo apt purge modemmanager

but that doesn't work now.

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Please post a link to the board. Is it like SMAKN® CJMCU-Beetle USB ATMEGA32U4 Mini Development Board for Arduino Leonardo : Amazon.com.au: Computers?

If it is indeed like Leonardo and has the Leonardo bootloader, tap the reset button. Assuming it does not have one, just short the reset pin to GND.
If there is an L-LED, it should slowly fade in-and-out for a coupe of seconds. During that time you should also get an entry in lsusb.

Further, with the board disconnected, run dmesg -w; the application will not close.
Connect the board and observe any changes in the output. Any pointers to a possible problem.
Next tap the reset button and observe changes in the output.

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