[FS#865] Upgrading Firmware is broken on Linksys EA9500

[LEDE Bugs]

The following task has a new comment added:

FS#865 - Upgrading Firmware is broken on Linksys EA9500
User who did this - Matthias Schiffer (NeoRaider)

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I have pushed a few commits that might fix this issue to the "sysupgrade-fixes" branch in my staging tree at https://git.lede-project.org/?p=lede/neoraider/staging.git;a=summary . I don't have a BCM53xx test device, so the fix is untested.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=865#comment2925