HP-50G screen black at startup...

[JanS]

With regard to low capacity SD Cards, it may help to search for industrial grade MicroSD Cards. Those are generally available in 2 GB Size and work with an Adapter from MicroSD to SD. No Need to spin up a linux USB Drive or any other shenanigans. They are a bit pricey, however they can even be formatted in the calculator itself - and Windows reads them just fine that way.

YMMV, just my $0.02

Syslogic in Germany even still sells 2GB SD Cards:
https://www.syslogic.shop/sd-cards-indus...%5D=433085

or you just google for these keywords and look at the shopping results: 2gb industrial micro sd slc