Ethernet adapter not working with big sur update?

after doing EVERYTHING on my end to diagnostic the problem. I believe this is definitely a firmware problem. Since they can’t release firmware update like they did with the OS, without swapping out the hardware, I don’t think it can be fixed in the short run.

Just got response from apple, they want me to change the I/O board. Luckily I still have apple care since the logic board on the iMac Pro cost a fortune.

this adapter of mine still works - https://www.amazon.sg/gp/product/B071HF3ZYQ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1. my more glamorous Anker and Targus adapter stopped working with Big Sur :(

I am not an expert, but plugable claims this issue is caused by ASIX not timely providing the correct driver for their chipset. plugable also says they (plugable) have some Ethernet adapters based on Realtek chipsets that work with Big Sur. See https://plugable.com/2020/11/13/asix-ethernet-adapters-unsupported-in-macos-11-big-sur/ .

Evidently Belkin adapters are the closest thing to an Apple adapter, and do not require installation to use them.

I bought a new MacBookPro and as part of setting it up, updated the OS to Big Sur. Then the USB adapter I had did not work. Someone at the store where I bought the adapter told me about Belkin. They had the Belkin USB-C multimedia hub in stock (https://www.belkin.com/us/p/P-F4U092/) , and we tried it at the store. It worked fine for the USB. It was working fine for the ethernet until yesterday. I am using it now as I write this, but the internet suddenly drops off sometimes.

Although not ideal for the long term, I have been able to use my travel USB-C to Ethernet adapter plugged into the side USB-C port.

https://smile.amazon.com/gp/product/B0837QGZMY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I used an Anker USB 3.0 to Ethernet Adapter, PowerExpand USB 3.0 to Gigabit Ethernet Adapter, Aluminum Portable USB-A Adapter Compatible for MacBook Pro 2015, MacBook Air 2017, . I have a (Late 2013) Macbook Pro ( Big Sur ver 11.0.1 ) and it worked. All I did was connected Adapter and then restart the computer. Works perfectly.

My mid 2015 MacBook Pro using a Thunderbolt to Ethernet adapter works but not with a Belkin USB 3 to Ethernet adapter. Given my experience with the WiFi bugs in iOS 14 I am further disappointed in the release quality coming from Apple.

I'm having the same problem with my iMac 27" 2017. I have I think that it has something to do with going to sleep and then does not wake up the ethernet port. If I disconnect the ethernet cable it works fine on WiFi. I have Spectrum 1gb service.

https://www.amazon.sg/gp/product/B071HF3ZYQ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

I just ordered this one, recommended by yamesjeong. Just received it, tested it and connected now! Happy.

(My J5Create ethernet adapter doesn't work after the update.)

I have run into similar problems with two adapters since installing the official Big Sur release - the J5 Create didn't work and a not of incapability came up immediately, the Insignia NS-PUCHUB210-C works for the most part but then glitches out as near as I can tell quite randomly throughout the work day. Looking for Driver patches.

I had the same issue, it drove me nuts cuz I use an external monitor, which connects to my MacBook through the adapter. Before Big Sur, I had Catalina, I used to plug in the adapter in in 1 port and the charger in the other. This setup did NOT work with Big Sur. Last week, I tried to plug in a USD Pen Drive using the adapter and the system did not even read the Pen Drive. I had used this Pen Drive multiple times with previous the MacOS, which made me wonder if there was something wrong with the adapter. So I plugged my adapter into my iPad and it worked perfectly. I then connected the charger cable into the adapter and then plugged in the USB Pen Drive into the adapter, AND IT WORKED. I then connected my screen in the adapter and it worked as well. But the connections on the adapter only work when the charger cable is connected to the adapter.

I believe what may be happening is the bitch motherfuckers at Apple are intentionally taking away support. My internet is slower than Steve Jobs and I don't think anyone is watching or interested in helping us. Love my Mac!

I have a brand new M1 MBP, and a 4yr old Intel MBP. I have the Belkin USB-C to gigabit ethernet adaptor that Apple sells, and a random one from another company. Both adaptors on both computers don't work. Resetting PRAM, updating macOS 11, etc etc, nothing works.

All my computers are stuck on wifi right now, and (relatedly) neither computer can use my HP printers... Apple, help!

Apple Support is rarely helpful. At this point ethernet adapters have been relegated to the past. WAN is your best bet, unless you want to revert to Mojave... a pain in the neck without a previous backup, but doable!

I have the same issue on Macbook pro 2017

My usb-c ethernet was working with built-in driver on Catalina successfully. After upgrading to Big Sur, it was working again for few hours and suddenly it become disconnected. Now it says Cable Unplugged in network preferences.

The producer of my ethernet adapter hasn't provided any driver even for MacOS Catalina and says no driver is needed.

It's corechip SR9900