To make it hybrid (bootable on both USB/SD and CD):
Standard recovery tools like Recuva or PhotoRec often fail because the computer cannot "see" the original storage sectors. 3. How to Fix the SD Card abcd.iso sd card
: Users have reported that inserting a new card into a phone (such as UMIDIGI or budget brands) results in the phone "rediscovering" the card as a 2GB volume containing abcd.iso , wiping all previous music and videos. To make it hybrid (bootable on both USB/SD