[FS#1437] Trunk r6421 not save configuration on ER3.

[LEDE Bugs]

The following task has a new comment added:

FS#1437 - Trunk r6421 not save configuration on ER3.
User who did this - Andy Lee (linhtinh)

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Seem like problem same as https://bugs.openwrt.org/index.php?do=details&task_id=249&status%5B0%5D=&pagenum=4&order=severity&sort=asc

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1437#comment4488