Before you order a replacement, try the official .
Similar to the S7IMG tools, this utility can be used to restore a backup image of a Siemens MMC. If you have a fleet of PLCs, it is highly recommended to create a "Golden Image" of a blank, formatted MMC for each size you use. Step-by-Step: How to Recover a "Bricked" MMC
For users without the full TIA Portal suite, the SIMATIC Automation Tool can format cards via the CPU's network interface.
Cons / Limitations