I own 3 JetKVMs, of which two of them stopped working, one of which doesn't boot at all and the other that never connects to network. The third I took out of service because the keyboard wouldn't send input when it was connected for more than a couple months. I'm sure the newer hardware is better, but I'm very unhappy with my JetKVMs.
I have two and one stopped working, but they were great and sent me a replacement motherboard and a toolkit to swap it over. Did you try reaching out to them?
I learnt this first myself from HN, a few months ago.
https://docs.espressif.com/projects/esp-dev-kits/en/latest/e...