Ethernet stopped working, and so is the webgui

Untill now my new nanokvm did work, but now for some reason it cannot connect to the internet anymore
I see no uplink to the router, but I see that the storage linux gadget function is workin:

So I tried to connect in ssh into it through RNDIS as provided by the docs

But the connection keeps getting refused

So I connected a ch341 clone through usb/uart to the nanokvm, and I can get output, but I also get:
"INII :
ld "acm"
respawning too fast :
disabled for S minutes"

which I don't know what is it? all I could find on google it's about issues of configuration issues for serial interface through virtual machines, which is not the case here?

when rebooting the device, I get
"[SAMPLE COMM ISP Thread]-9S:
= 1920
1080
maix multi—media init 0k
cry release vio 0k
try release venc 0k
ISP Dev O running!
lmf add
udhcpc :
udhcpc :
udhcpc :
udhcpc :
udhcpc :
vi channel..
broadcasting discover
broadcasting discover
broadcasting discover
broadcasting discover
no lease, forking to background"

so it looks like the ethernet/dhcp is failing to initializate?
But I know for sure that the ethernet port of my router, the cable, and dhcp do perfectly work, as with other devices there are no problems, except for the nanokvm....

I don't know what else to do? if it's again an hardware porblem, it's pretty bad, as it's the second device that just fails, the first one burned down through the usb port, the second one (this) worked fine for a while, and now the ethernet port seems to have died

the interface looks OHKO to me, but I may, and I hope that I'm wrong

Start with the UART boot output, especially the repeated udhcpc discovery failures and refused RNDIS SSH connection, and compare them with the project's networking and SSH/RNDIS documentation. Done means determining whether the fault is configuration/software or failed Ethernet hardware and documenting a reproducible recovery or replacement path.