Like the title above me says this is happening to my r4 card. The r4 reads it fine and I can fully play with it but I need to update my firmware since I am sharing that card with my brother who accidentally updated his system to the latest update. It stopped working on the T-Flash USB adapter that the r4 came with, and it now stopped working with my adapter. It's not corrupt it is instead says disk cannot be found in drive x and the icon is grayed out, however the adapter seems to detect as it changes the light to the detected light. Is there any possible fixes to my Micro SD card, or is it irreparably broken?