Is it picked up by your PC or laptop? That would have been my first troubleshooting step.

Figure out whether it's a problem with the hashboard / standard unit or the controller / full unit.
I would recommend the
https://kano.is/ solo pool by kano. Not sure where solo mining sits on jstefanop's roadmap!
It's a brand new batch 1 device that I unboxed a few days ago. Setting up a dedicated rpi zero for testing will be the next step that weekend. That's way more effort to setup compared to the full node extension, that's why I didn't do it as first thing
Oh don't worry, you can also test the hashboard with any other PC! Doesn't have to be a Raspberry Pi and not even a Linux PC.
It can just be your daily driver, simply to quickly verify the hashboard is fine.
Download directly from jstefanop:
https://github.com/jstefanop/Apollo-Miner-BinariesJust attached the standard unit to a new rpi unti and got the latest apollo-miner binaries (32 bit in this example).
>>> Waiting for USB /dev/ttyACM0 [0] !!!
Stratum Pool started.
Initial difficulty: 1024
Connecting to us-east.stratum.slushpool.com:3333...
Connection successful
Server setup for us extranonce1: 03650503f8be74
Server setup for us size of extranonce2: 8
Pool changed difficulty to 8192
EVENT: 2022-10-10 15:03:08 ::: DIFF_CHANGE ::: Difficulty changed: 1024 => 8192
EVENT: 2022-10-10 15:03:08 ::: POOL_CLEAN_JOB ::: jobIdCounter = 100, JOB: jobName: 18a8f53a72, prevHash: bdd33d711aae5e3f5af0d28b1cc52c48443b100f0003dc4c0000000000000000, nTime: 0x6344261c, cleanJobs: 1
Queued job 101 [18a8f53a72], job count = 1
>>> Waiting for USB /dev/ttyACM0 [1] !!!
Authorization succeeded.
Pool in-service, we can send shares!
EVENT: 2022-10-10 15:03:08 ::: POOL_INFO ::: Pool in-service
>>> Waiting for USB /dev/ttyACM0 [2] !!!
>>> Waiting for USB /dev/ttyACM0 [3] !!!
>>> Waiting for USB /dev/ttyACM0 [4] !!!
>>> Waiting for USB /dev/ttyACM0 [5] !!!
>>> Waiting for USB /dev/ttyACM0 [6] !!!
>>> Waiting for USB /dev/ttyACM0 [7] !!!
>>> Waiting for USB /dev/ttyACM0 [8] !!!
>>> Waiting for USB /dev/ttyACM0 [9] !!!
>>> Waiting for USB /dev/ttyACM0 [10] !!!
>>> Waiting for USB /dev/ttyACM0 [11] !!!
>>> Waiting for USB /dev/ttyACM0 [12] !!!
I can see that ttyACM0 IS NOT there. All I get is this short message in dmesg after plugging it in:
[ 419.698180] usb 1-1-port4: connect-debounce failed
All command were entered as root. Any ideas?