[FS#380] sysupgrade corrupts firmware on ASUS RT-N16

[LEDE Bugs]

The following task has a new comment added:

FS#380 - sysupgrade corrupts firmware on ASUS RT-N16
User who did this - Nikolay Amiantov (abbradar)

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I'm still waiting for my UART adapter. However I've tried to use sysupgrade without keeping old configuration and indeed it worked!
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=380#comment1295