I have hit a little problem with choosing a CDA/Custpack from the download area of Custpacks W580i.
Q1. Can I just pick any generic one? Do I have to worry about the CDA number?

All I want to do is have flash menu. I believe my phone is not branded as it is UK O2 hence I am not flashing the firmware nor FS.
Q2. Am I wrong with this assumption?
Q3. What's an EROM?

This is a great site, but is there a noob/dummies guide in 1? Most information is spread everywhere and my head is exploding :<
Thanks in advanced.

Note: My phone details:

23:43:52| Profiling SEMC phone...
23:43:52| Baseband ID: DB2020
23:43:52| OTP CID: 51
23:43:52| EROM CID: 52
23:43:52| EROM Color: Red
23:43:52| IMEI: 35683401xxxxxx
23:43:52| Phone ID: W580
23:43:52| Network: EUROPE_2
23:43:52| CDA: CDA102774/101 R3A
23:43:52| Firmware Version: R6BC002
23:43:52| EROM: R3A022