CWWK Firewall 2,5G Server i7-1355U i5-1235U i3-1315U 6x Intel i226-V 6 LAN 2*DDR5 NVMe SSD Lüfterloser Mini-Router-PC AES-NI ESXi

Unfortunately the unit I received experienced random crashes, would not see the SSD, and was unable to maintain BIOS settings. All these point to a motherboard problem. I contact support. Initially the response was quick. They sent me a new BIOS to flash to see if that would solve the problem. However, after flashing it, the unit worked even worse. It turns out support sent me a BIOS that is incompatible with my unit. I have been waiting for a week now to get a new response from support.

At this point, I am considering requesting a refund, since the unit is not totally inoperable.

When I turned on the mini pc for first time I saw a little terminal called UEFI Shell, but previously I connected a USB with Ubuntu Server Installer. Instead of start installation process, the UEFI shell appears every time. Check in BIOS and the USB nor NVME does not appear as boot device :(.
I spend 2 or 3 hours checking what the problem were. Finally, I found a solution (I think): My Ubuntu Server booteable USB was connected in a USB 3 port (the blue one), just connected it in a regular USB port (black ones) and ¡vualá! :)

PD. I will need a fan.

My purchase:
CWWK Firewall 2.5G Server
i5-1235U
6x Intel i226-V 6 LAN
64 Gb RAM
NVMe 256 Gb

This router/firewall mini server is simply awesome. I installed windows 11 just for testing purpose, now I incline to leave it as this, and buy another one for router/firewall. Thank you very much!