My girlfriend's Samsung Galaxy S10+ suddenly displayed a black screen with yellow text saying 'SELECTED SD CARD BY YOUR KEY INPUT,' and now it's stuck. Any ideas on how to fix this?

[sadik2511]

She recently put the phone in a new case, so it’s possible some buttons got pressed accidentally. We tried a hard restart, but that led to a screen that looks like a DOS interface with 'SS RDX' at the top and a lot of unfamiliar text. Does anyone know what's going on or how to resolve this issue?

[angelg4]

Try this.

This isn't my photo.