Hello,
I'm in the process of upgrading my network to 2.5GbE so thought I'd pick up the Terramaster A-USBLAN-2.5G for my F5-221, however after pluging the device in it doesn't seem to be detected in TOS 5.1.37. I was assuming a new interface would show up along the lines of "USB 1" or such but I still only see Lan 1 & Lan 2 under Interfaces. I hooked the adaptor up to my Windows 11 PC just to test it was working OK and it was recognized as a 2.5GbE network adaptor and worked fine. Also tried reinstalling TOS as a long shot but still no joy.
Any suggestions as to why the NAS can’t see it?
F5-221 and USB 2.5G LAN Adaptor
- crisisacting
- Posts: 189
- Joined: 20 Jan 2022, 16:42
Re: F5-221 and USB 2.5G LAN Adaptor
Check through SSH to see if it's even detected using the following command:
Also, check your built-in Ethernet ports, as some people have mentioned having an upgraded 2.5 Gbps adapter already present, out of box; use this command during the same SSH session:
Code: Select all
lsusb --verbose
Code: Select all
lspci | grep Ethernet
Re: F5-221 and USB 2.5G LAN Adaptor
Looks like it is being detected as I see this in the output:


Re: F5-221 and USB 2.5G LAN Adaptor
Didn't notice there was another thread in this board with the exact same problem. Looks like it doesn't work with TOS 5 only TOS 4. Bit annoying since I'm not going to be downgrading too use it. Does any one from TerraMaster know if this will be resolved?
Re: F5-221 and USB 2.5G LAN Adaptor
After a lot of testing various version of TOS and many, many factory resets the latest version of TOS I can run that will still successfully show the Terramaster USB 2.5GbE adaptor in the network interfaces is 5.0.176 any attempt to update past this point to a TOS 5.1 version causes the device to disappear from the Network interfaces window in TOS desktop.
At least there is a way to get a Version of TOS 5 running, hopefully at some point it can be made to work with a TOS 5.1 version.
At least there is a way to get a Version of TOS 5 running, hopefully at some point it can be made to work with a TOS 5.1 version.
Re: F5-221 and USB 2.5G LAN Adaptor
Your persistence in verifying the problem is admirable. We will verify the issue.
To contact our team, please send email to following addresses, remember to replace (at) with @:
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Re: F5-221 and USB 2.5G LAN Adaptor
Thanks for looking into this.