Just tried to update my RC controller to the latest firmware and got this message, DJI Update server error Code:0x1103a0090012
after doing some research I was advised to use DJI assistant and update via my laptop which worked a treat 
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I had this problem the other day with the rc pro, however I think there’s a few having this problem at the mo, it came up on YouTube about an hour ago.
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Seems a common problem
I know, I think it may have been on the last couple of recent updates, I’m not updating nothing yet 
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Same with me, connected it to DJI assistant and everything worked ok.
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The DJI assistants are a tad tricky. If none work try a different usb cable. It can make the difference. It doesn’t work on iOS either.
I did the update via my MacBook Pro which was very straight forward then had to pair my Mini 3 pro and Mavic 3 again to update.
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Just my tuppence worth: yesterday I updated my M3P and RC via the RC and my N1 via the Fly app all without problem and no need for Assistant 2.
Could have been a temp server hitch (lots of people piling in all at once?) which might now be over.
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Leave it for a few minutes and retry … Had the same issue last night and after several attempts all went ok
I used to find using my mobile network as hotspot when router failed and also been faster at times downloading big files. 