[FS#617] Root overlay FS is too small given available flash

[LEDE Bugs]

The following task has a new comment added:

FS#617 - Root overlay FS is too small given available flash
User who did this - Felix Fietkau (nbd)

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Increasing the partition size is incompatible with the dual firmware image layout used by the vendor firmware and boot loader configuration.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=617#comment2169