I think this is the issue... The External LED stops blinking at the half way point and some might think it froze but its normal and they just need to wait until it reboots which can take 2 more minutes.
Process should be done in the following order:
1. CPU Firmware needs to be updated (Normal process which takes around 60 seconds)
2. Control Set needs to be connected and will work with no voices and then the HiFi Control Set firmware needs to be loaded and then the VoicePack but both files can be on the same drive and will go in this order automatically.
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