Can't receive or make calls

[yvmuell]

The most important point is: never downgrade what William did

@hirnsushi

If everything is as it should be, meaning the security patch level of the factory images you are flashing matches / is higher than the current ones and the keys those images are signed with are the ones the system expects, get_unlock_ability doesn’t concern you at all.

But for your example where you installed old factory images, that would have been a brick

@hirnsushi

Now there’s apparently a bug in certain Qualcomm bootloaders (according to the CalyxOS devs) which affects the Fairphone as well that leads to the rollback never being reset. So on any devices (not only Fairphones) affected by that the only way is forward.