flash #postmarketOS rootfs to userdata.
Reboot, switch slot, flash boot image, erase dtbo, and boot
turns out there's just no conflicts, Android userdata and postmarketOS rootfs can just coincide on the same partition
All the space is available for use by both systems. And with a very neat A/B slot control tool for Linux mainline coming soon, completely untethered dual booting will be easier than ever...
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