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OK, there may be a problem if you only get the "Check for update not available at this time. Try again later." message. You should be getting "Your device is up to date! No update is necessary at this time."
You can install the update manually, if you want to. A good thing is to temporally move your music, pictures and videos to your PC as the updating of media files can take hours if you have a lot.
Another thing you might try is to power down, remove the battery and sim card. Then replace the battery only and power up all the way. Next power down replace the sim card (you'll have to remove the battery temporally in order to do that) and power back up.
Have you tried pulling connected to wifi with the same result? If so, you can try a couple of different things. I would start with pulling battery- pull sim - wait a minute, plug all back in and power it on. Once fully connected to the network try again.
You lost 4g- so is the service not in your current area, or your phone just doesn't connect to it any more? If the above doesn't work, I would try an FDR next. If that doesn't go, you may have to go a little more creative.