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First time I tried to update I got a failure. I rebooted and tried again and it processed successfully.

A LOT of people on G+ are reporting a download failure. I've tried dozens of times with no luck. I've rebooted a couple of times to see if that made a difference but again, no luck. What's even more strange is that the JB update for any country doesn't appear on ASUS' website.
Yeah, I tried that.
The update failed to even appear after a reboot.
It's as though the update no longer exists for my device.....as though there never was an update.
Many over on xda are getting same internet problem. Many are guessing asus servers are overloaded.
I've been trying for the past 24 hours without success. I just sent a message to Gary to find out if the issue is due to overwhelmed servers. If I hear back from him, I'll post it here.