Liliputing has found the PocketBook Era FCC page and there's quite a few internal pictures there.
https://liliputing.com/2022/06/pocke...h-support.html
Here's the FCC link they link in their article (where you'll find most of the pictures). Doesn't look like there's an SD card on the board (or anywhere)...
https://apps.fcc.gov/oetcf/eas/repor..._id=2AUVWPB700
Looks like the model number is PB700.
This FCC site is probably better...
https://fccid.io/2AUVWPB700