Yes, I did. The whole history is: to root my new FP4 I followed this :
So I start to unlock bootloader following this:
https://support.fairphone.com/hc/en-us/articles/360048646311-FP3-Manage-the-bootloader
The installation of Magisk went well and almost everything was fine for two months. I says “almost” because a bank app refuses to work, even with Magisk hide fonction, because of the unlocked bootloader.
To avoid reformatting my phone I disabled the authorization to unlock the bootloader in developpers settings. The apps bank don’t works anymore, but the phone is ok, until the last Magik’s update.
Other thing. When I tried to boot on TWRP image, I can’t wipe cache, because critical partitions was locked.
That’s when I saw that I couldn’t flash the original FP4 rom, I wanted to go back to the original state and re-lock the bootloader via fastboot flashing lock. And FP4 was blocked.
If I look at the /e/OS installation tutorial,
https://doc.e.foundation/devices/FP4/install
I see that not only the bootloader had to be unlocked fastboot flashing unlock, but also the critical partitions fastboot flashing unlock_critical, which the Fairphone manual does not say. I think that’s where my problems come from.
I think I have a point to make with Fairphone’s support: their tutorial don’t mention the need to flash critical partitions too. If “the Fairphone 4 (FP4) gives you the freedom to unlock your bootloader” it must also give us the resources to do so.