I have a FP1 and had to make that upgrade when your memory space is too small: to combine the partitions. It went awfully wrong, my phone didn’t do anything anymore. I sended it back to Fairphone and they fixed it for me. Yesterday i got the phone back. I installed the apps again and sent a few apps.
But tomorrow i got the message that Fairphone OS had stopped! I restarted the phone, and now it works again normally. But i am afraid that something is wrong with my phone and that i will keep on having this problems.