Fairphone’s (everyone’s?) Android upgrade uses the alternate slot for upgrading. Is there a way around this? I have postmarketOS installed using the other slot, so after every Android upgrade I have to reflash pmOS to the slot previously used by Android.
Welcome to the community forum.
Installing FP6 is done via flashing with fastboot according to https://support.fairphone.com/hc/en-us/articles/18896094650513-How-to-manually-install-Android-on-your-Fairphone.
It should be possible to look at what gets flashed where to install, then apply the necessary steps manually to direct the update to the desired slot.
I have neither an FP6 nor done this myself, but …
At the time of writing, the install ZIP file for FP6 contains the flash_fp6_factory.command script, in which the flashing steps can be seen starting from flash_device(), addressing the slots via partition suffix _a and _b. If done manually, you could of course leave out the slot your postmarketOS is in.
I’ll leave you to it to try, or to perhaps wait for others with actual experience with this 
.
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Thank you. Excellent.