[FS#485] DIR-825 B1: CameoAP94 profile restricts image size to 4 MB

[LEDE Bugs]

The following task has a new comment added:

FS#485 - DIR-825 B1: CameoAP94 profile restricts image size to 4 MB
User who did this - Matthias Schiffer (NeoRaider)

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It seems the actual firmware part of the factory images must always be exactly 4MB, at least this is what I understand from reading our code.

As long as noone has more information on this and is able to generate flashable factory images with bigger firmware partition, our behaviour seems correct to me.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=485#comment1962