CIA probably has easier methods, but I'd dump partitions with EDL if it's a Qualcomm model then go from there (userdata's likely ext4 encrypted)In my case I have an Xiaomi Redmi Note 10 which looks as though it boots up normally but none of the apps work. It receives incoming calls and texts but they can't be read and none of the data can be accessed.
Now if I had some top secret data on this phone which the CIA wanted to access, would they simply accept that it is not accessible or would they find some way to retrieve the data.