NeoLinkMasta cannot back up save data. No reply from customer service.

[treefroggy]

Started having this issue just a couple months after getting my flash masta in 2018, I e-mailed customer support around that time and never received any reply. Took me this long to realize there is a forum I could come to. I have enjoyed this flash cart, although I have only been able to enjoy two games, because the backup save data feature stopped working, so if I want to flash a new game, I'll lose many hours of progress, which isn't cool. I want to buy the new Wonderswan flash masta, but I'd like to resolve this issue first.
https://imgur.com/a/rCoFALW