Extract UBI volume from U-boot over serial (Aruba AP)

[NiKiZe]

I have an AP (Aruba IAP-315) where I want to try and get some configuration data from.

This U-boot clone (apboot) is very limited, especially in getting data out. I did first attempt to boot a more open kernel and firmware, but the firmware format is also non standard, so initial attempts at that also fails.

I have found this possibility to read "the volume data" not sure this will even work.

ubi part ubifs
ubi info
ubi read 0x44000000 ubifs
md.b 0x44000000 63361024

I would like to receive any insight on any kind of special cases I would need to think about if performing this.

But I would also like to attempt an "over serial block device read" what this would do is convert any read request to commands sent over serial.
It would send md.b 0x44000000 2048 to read first 2048 bytes and dynamically adjust any requests.
One goal here would be to get a filesystem dump, without reading every byte of the volume (that would take around 40 hours over 9600 baud)

I fully acknowledge there will be challenges, but is there anything about ubifs (which I so far understand very little about) that makes this approach unusable? For example, do I need to get data that isn't available from this kind of memory dump?

More info about the device in question https://gist.github.com/NiKiZe/19fb14f665f36db494769ae196e6b04e