Firmware upgrade path
Any 5.0.x release
↓
5.0.5 (Build 0188)
↓
5.3.26 (Build 0466)
↓
6.0.6 (Build 0228)
↓
6.0.10 (Build 0280)
↓
6.4.4 (Build 0414)
6.4.x releases can be upgraded to 6.4.4 release directly.
After every upgrade, verify that the build number and version number match the image that was loaded. To do so, go to Dashboard > Status.