I purchased from Amazon a case that will hold 4 CF cards along or 4 CFexpress B cards.
I have always formatted SD card in my cameras. Doing it on a computer will have a different file structure vs camera file structure.
Used it 4/4/2023 sending cards with no problem.
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You said you have the 1.10 firmware in camera procedures is going from 1.10 to 1.11. I had no problem when I did mine in Jan. 2023.
Procedure to update to 1.11 from 1.10
I use TrueSHOT MEDIA STRAP by USA GEAR which has two battery storage pockets.
Does your folder show the download if so, open the folder and you should eventually see a bin folder which you put on sd card and install update - remember camera battery must be more than 50% charged.
Just updated my D850 last week with the latest firmware without any problems.
When I went to Germany in Nov. 2022 I went with this BESTEK Universal Travel Adapter, Worldwide Plug Adapter 110-220V to 110V Voltage Converter with 6A 4-Port USB Charging 3 AC Sockets and EU/UK/AU/US/in International Outlet Adapter(White) on Amazon as I used it to charge iPhone, camera batteries & iPad with no problem.
In photo 4 it show -E- that is what he is asking about.
No problems with either one.
Latest firmware for the Z6 ii is: Z 6II Firmware C:Ver.1.40 2022/04/20