It says that your flash is fine:
Code:
csdview csd.bin
Manufacturer: 0xd6
Version: 5.1
User size: 122142720 blocks, 58.2 GB
Boot size: 8192 blocks, 4.0 MB
RPMB size: 8192 blocks, 4.0 MB
Cache size: 1536 blocks
Life used: A: <10%, B: <10%
End of life: Normal
You can try doing an update then reading the check.img to see if it matches.