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I had difficulties myself, it gave a status "invalid" and after the firmware upgrade to 1.10 SD Status "Reinitializing". I found a solution in processing the following steps:Format the MicroSD in your computer on NTFSDisable SD Recording (duh )Disable Motion Detection (Don't know if it makes any sense, but I happen to do this at the time together with step 1)Insert the SD Card and format it from out the "SD Maintenance" menu.I do not use additional software, just the webinterface.Formatting the SD Card to FAT or FAT32 (with different sectorsizes) did not work, so I guess the key lies within the NTFS formatting on default settings.Please let us know if it worked