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[NVS2501 UDF SPecial] Firmware V1.56 - Bug fix 2014-04-18

Applicable to UDF Special Version of NVS2501 only.
Not for NVS2501 normal version which format internal hard drive using FAT32.

* V1.56 (2014.4.18)
- Bug fix for possible data corruption.
- If the internal/external HDD formatted by NVS then formatted again at computer to another format, NVS cannot properly detect the format and overwrite data to undeterministic position which results in data corruption.

* V1.54 (2014.3.11)
- Bug fix for the Windows computer connectivity
- If the NVS2501 UDF is not detected by Windows computer, then upgrade the firmware to this version.