It's hard to open, there are some plastic tabs inside and some will break.
You can close it again with the screws, but some tabs will be missing inside.
@Edrikk
I also boot looped (with robi repo build r0-*, 2023-01-08-1438) and already posted the log here:
https://forum.openwrt.org/t/adding-openwrt-support-for-xiaomi-ax3600-part-1/55049/9801
Then I have read this issue was fixed, don't know in what Robi build, so maybe @joba-1 had the problematic old Robi build.
It was fixed here (2023-01-12):
https://forum.openwrt.org/t/adding-openwrt-support-for-xiaomi-ax3600-part-1/55049/9909
Don't know that old build version, only the post date.
@joba-1
Can you tell what is the build date of r0-71addb3 you had before upgrade?