Use a USB drive under 32GB formatted to FAT32 . Higher formats like NTFS or exFAT will not be recognized by the NVR.
: 16MB SPI flash (often utilizing chips like the MX25L128XX) partitioned into functional zones. MTD Memory Partition Table Layout k9604w firmware
Complete K9604-W Firmware Guide: Upgrade, Recovery, and Troubleshooting Use a USB drive under 32GB formatted to FAT32