You'll need to re-upload the factory firmware. I think I saw someone uploaded it 3rd party in M5Burner. If not, I ripped a clean copy of my firmware and I'll share it tomorrow. Just click "ALL" and then search "cardputer" in the search box on the M5Burner app.

I need to update the firmware for one of the Stick C Plus apps I made., and I cannot login to the M5Burner from Windows or Linux. Linux tells me it's receiving a 504 error which is usually a CDN or reverse proxy timing out.