[FS#810] Sysupgrade fails since r4188-e96a9a9af8in (ipq806x R7800 NAND device)

[LEDE Bugs]

The following task has a new comment added:

FS#810 - Sysupgrade fails since r4188-e96a9a9af8in  (ipq806x R7800 NAND device) 
User who did this - Hannu Nyman (hnyman)

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Offending code has been removed by r4213-361c8b4ee4
https://git.lede-project.org/?p=source.git;a=commitdiff;h=361c8b4ee4a20035d4c967d9d67db90d53e924a2

But if somebody has already flashed a firmware with revisions r4188 - r4212, he may need to remove the changes done by r4188 before doing sysupgrade. The need may depend on his flash type. Editing /sbin/sysupgrade manually is the easiest choice, as the changes are just one code block.

This bug report might be closed, but on the other hand, users will hit this bug only when they try sysupgrade, so reports may trickle in for a long time and an open bug may help somebody to get things fixed.

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=810#comment2674