DSM 7.1 (update to U3) "failed to update. File probably corrupt."

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During step 1 of trying  update 3 to 7.1.  It fails when I manually install from the GUI.  I downloaded the file (broadwellnk-7.1.0-42661.pat) directly from the Synology download center.  Thoughts or ideas on the issue?  DS3622xs+ on AMD MSI 7641 mobo been running fine on 7.1 update 1.

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For anyone who successfully updated DS3622xs+ 7.1 from U1 (or U2) to U3...  would you please reply with the size of the U3 update .pat file?  The one Synology has for download is 51MB.  Seems kind of large for a small update file.  Just trying to make sure I'm using the right .pat file.

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Seems this "corrupted file" error must be kind of unique.  Tried about a dozen downloads and updates.  I have to assume it's some kind of problem with my existing DSM install... which otherwise runs fine.  Maybe I'll try going to U2 first.

[Marcus6]

I was getting "corrupted file" error whet DSM was waiting a complete installation file from me (300+ MB), while I was selecting just a patch (30-50MB)

As for update 3 installation, I've used the command mentioned here. For me it worked well. 

 

Edited July 18, 2022 by Marcus6

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Problem is, the corruption error happens during the "Update U3 from GUI" process so I never get to the TCRP commands step.

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I have how tried the U2 patch with the same "failed to update file... file is probably corrupted" error.  This happens very quickly.  The first time I got the error.. the update process had been proceeding for maybe 2 or 3 minutes.  Now it's instant.  As if my 1st attempt corrupted something in my system.  As it appears nobody has had this error (at this stage of the udpate process) I'm very open to any troubleshooting ideas.  Should I do a fullupgrade to TCRP before trying the GUI update?  could that possibly make a difference?  Anything else I can explore?  I doubt if these update .pat files are truly corrupted...  thanks in advance.