I have sandisk 64gb SD card and have it working on Roku Ultra
1. Format SD card on Windows 10 pc with Quick format with exFAT file system.
2. disconnect Roku from power/hdmi/ethernet cable.
3. Insert SD card into Roku.
4. Reconnect Roku from power/hdmi/ethernet cable.
5. power on TV/Roku.
6. Roku recognizes SD card and asks to format, choose yes.
7. Takes about 5 min and everything was good to go.
Seems I'm late to the party...
My Roku 3 just stopped connecting to any of my wireless networks last week. Is that likely because I never got an SD card? If so, thanks to those who have gone before and have posted card specs, etc
Or, is the new update 10.5 the more likely culprit?
Using a SD card "may" cause some connection problems (often because data may become corrupt), but the lack of/not using an SD card will not cause connection problems. Normally you will get a "memory" error message.
Feel free to create a new thread with the issue you are having and mention @AvsGunnar in your message so it will alert me you posted.
This solution worked for me, thanks for posting.
Just went throught his myself. Have two Roku 3s, and one died recently from lack of use (really! maybe five hours total on it). So replaced it with an LT (2017?), and added another LT to a third TV.
After doing some reading, and from experience with picky dashcams, ordered Transcend 4 GB C10 cards. The LTs took them without problem; no preformatting required. But the Roku 3 (4200X?) wouldn't, despite trying everything in this thread.
Found an old 2 GB card, from an old digital camera, and reformatted it on my W10 PC. And the Roku 3 took it (including asking to reformat) without problem.
So ... Transcend Premium 4 GB C10 cards are apparently on the 3's verboten list.
I just bought a Sandisk 32GB and inserted it in my roku ultra. It wasn’t reading it at first. I had unplugged everything when I put the sd card in. Then I tried system restore. Nothing happened. I selected a channel I hardly use and voila, it asked to format the sd card. Whew!
My no-name 64gb card was recognized after removing and reinserting while the Roku 3 was powered.
32 GB is the largest that it will recognize. Apparently, it is very important that the power be on when you insert the micro SD card. After many unsuccessful tries with the power off, I discovered that it worked immediately with my 4 GB class 4 cord if I inserted it with the power ON.