Can you downgrade back to 2.2.1??
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Glad your up and running 
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I'm having similar problems: Firmware update is running until it reaches "49%, unpacking...", then stops for about 10 seconds and I get the error: "Update has failed", sometimes i can then press ok and the KPA is still running normally, sometimes it won't react anymore and just show me the "Kemper Profiler" Logo.
Already tried removing all in and outputs (Jacks, XLR, Midi), but the problem stays the same.
Anyone experiencing similar issues?
/Edit: Tried formatting the USB stick, resetting the KPA to factory, nothing helped, still the same problem.
sounds like your download is corrupted. Try downloading the file again and make sure that you eject the stick properly from your PC using the Eject command. Simply unplugging it could corrupt the directory
Yeah same as Lambik I'd format your USB re download the firmware and then try again
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Ah, thanks, that solved the problem! Seems like my USB Stick was flawed. Sad thing is, that all my backups were on this stick and as I tried to restore after factory reset, it messed up some rigs and the favourite list is gone... happy sorting!
At least, 2.3 is now running 
it seems it was a long time from the last update, so the guys forgot how do that properly 
