Dahua NVR5208-EI User Manual page 120

Step 3 Fix the CD-ROM bracket at the HDD bracket.
Step 4 Install a pair of the CD-ROM bracket. Please make sure that the reverse side is secure too.
Figure 3-39 Take out CD-ROM bracket
Figure 3-40 Fix bracket
Figure 3-41 Install bracket
Figure 3-42 Install bracket (reverse side)
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User's Manual