This is a common re-occuring problem with the GoPro Hero 9 and there are hundreds of complaints about it by now. However there is a work around. Here's some pointers: You can use either a 128GB or 256GB SD card, both card sizes are fine to use in the GoPro Hero 9. The problem has mainly been reported with Sandisk cards.
usinG Your Hero3: basics GettinG stArteD Before using your hero3 for the first time: 1. i nsert a microsD, microsDhCâ„¢ or microsDXCâ„¢ card into the card slot with label facing forward, narrowest part of the card first. Speed Class 10 or higher cards are recommended. When using 0.5 second time Lapse or When it comes to selecting an SD card for your GoPro HERO11 Black or HERO11 Black Mini, it is always a safe bet to refer to the official list of compatible SD cards recommended by GoPro. This ensures that you choose a card that meets the technical specifications required for optimal performance. GoPro HERO11 SD Card Compatibility DRzf. 344 212 359 184 270 258 230 277 275