[FS#821] sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)

[LEDE Bugs]

The following task has a new comment added:

FS#821 - sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)
User who did this - diizzyy (diizzyy)

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@ Hans:
I provided both commits as data points as my r4263 build wasn't a vanilla/stock build.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=821#comment2716