[FS#742] Cannot "upgrade" from OpenWRT 15.05.1 to LEDE 17.01.1

[LEDE Bugs]

The following task has a new comment added:

FS#742 - Cannot "upgrade" from OpenWRT 15.05.1 to LEDE 17.01.1
User who did this - Yousong Zhou (yousong)

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Have you tried doing a re-login after the sysupgrade?  Very likely refreshing the browser session cookie should fix the 403 token invalid/expired issue.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=742#comment2668