I have 2 other important questions ;)
(I try to keep them in this post)

- What are the differences between the firmware versions (besides CID encoding which is getting stronger with each release)? Do they fix important bugs or is it just details that change?
Knowing this could help me make my choice between R1GB001 (CID49), R1GB001 (CID51) and R1KG001 (CID52)... Please help me choose!

- If I upgrade my phone with CID52 software, this means I won't be able to modify it afterwards, since it's impossible to brute force CID52 (for now)?