The other posts about big SD-Cards are closed, so here is my experience:
I inserted a new 64GB SD-Card with copied data from the old and smaller one. After starting, there was a message “abgesicherter Modus” at the bottom of the screen and in the wipe down screen was a message “broken SD-Card” with the only possibility to reformat.
Then I discovered, that the SD-Card was exFAT formatted and the phone doesn’t support that. So I reformat with the HP-tool to FAT32. Now there was no “abgesicherter Modus” but still “broken SD-Card”. Then I started the formatting with the phone (data was saved before) and voila, it works!
It seems, that there is a bit less capacity, because its shown 57,66 GB wich is about 61.911.953.572 Byte. I’m to lazy now to check the SD-Card again in a SD-Card reader outside the phone.