I’ve used ScanDisk 2,4, & 8 GB cards and some other off brand from Wal-Mart with no problem. I let the Java software program you provide do the formatting. I think I remember someone else having a problem when they formatted themselves in FAT 32.
Fyi, I had a 64gb card and it didn’t work until I downloaded a windows program to format it to FAT32. The windows 7 computer only allowed me to do exFAT which isn’t compatible with wallbox2mp3. So make sure you are formatting the card properly as the wallbox2mp3 to software will read and write on the card and say it’s good to go when you have it in exFAT even though the unit itself can’t read the card.
Just have to ask why a 64gb card? I have never used anything bigger than a 8gb & only then because it was free. For most installations I have used 4gb and occasionally 2.
I have Windows 10 on my PC and when I configure a card I click on the box in the wb2mp3 software that says format and build sd card and have not had any issues with the unit not being able to read the card.
Same deal, had a free 64gb card. I figured there might be an issue with it being incompatible, but I thought it might be helpful for future users as the smaller cards aren’t as common anymore. I’m going to use a 4 or 8 GB card once I get to the store.