Firmware upgrade path
Any 5.0.x release
↓
5.0.5 (Build 0188)
↓
5.3.26 (Build 0466)
↓
6.0.8 (Build 0260)
↓
6.4.2 (Build 0380)
After every upgrade, verify that the build number and version number match the image that was loaded. To do so, go to Dashboard > Status.