Thanks, but could you be more specific? There are so many firmware versions that it's impossible to understand which one to pick. All the tutorials say is pick one with same CID as the phone, but there are many versions to choose from, so which one should I choose?

R6DA001 CID52
R1KH001 CID52
R1JG001 CID52
R1JE001 CID52
R1JE001 CID51
R1JC002 CID52
R1JC002 CID51
R1GD002 CID51
R1GB001 CID51
R1GB001 CID49
R1EJ001 CID49
R1ED001 CID51
R1ED001 CID49