Helix 7 Lakemaster "chart card not found"

Last few trips using my Helix 7 Chirp SI G2N unit  on the ice I have been unable to use my lakemaster card. I have tried selecting map manually, restoring the unit to defaults, unplugging and plugging back in, and cleaning the micro SD. I don't know what else I can do to troubleshoot/diagnose the problem. I also put the chip in my computer and it seems the files are still there, although I don't know exactly what it should look like. I used another zero lines card and it was able to read maps I recorded myself.

Any suggestions on a solution or determine whether it's the card or the unit?