AP15/AP315 crossflash done, but tiny issue

Hi guys,

Been messing around to get an AP15 running openwrt. But before getting anywhere I tried to get the AP315 software to run on the AP15 (exactly the same hardware).
Tried to cross flash the boot loader and os from an AP315 dump to AP15. That worked!

However, I realised that by cross flashing I kinda messed up per-device data (ART partition). Is there any way to extract the partitions from an AP315 dump? The basics such as showing the mtd layout after boot are not permitted in Aruba os. And using binwalk and strings doesn't help me much here.

Anybody any idea how to proceed here without messing everything up?

Thanks!