Am I correct in assuming that the only way to get log output from sysupgrade is by connecting to the router's serial port? Running sysupgrade via Luci or via a ssh shell will not give useful output? And there is no sysupgrade log file somewhere in the file system after sysupgrade finishes?
No, there is no log preserved over upgrade, only files seen in sysupgrade -l
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Yes, serial is the only option as all network connections get broken.
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