All this sounds great, I have a K800i locked on SFR France, DB2020/CID51 :

Hold 'C' or '@'-(PDA) or '2'-(W88x) key and plug DCU60 USB cable.
Phone Connected...
Detected: DB2020: A1 Series
Phone IMEI: 35471601-177479-4
Color: Red ; OTP CID: 51
EROM CID: 51
Phone Model: K800i
Operator: VFE_LIVE_2
CDA: CDA102511/39 R12A
Phone Firmware: R1CE001
Firmware CXC: R1CE001_prgCXC1250211_VODAFONE_WI
WARNING!!! Firmware not supported for patch unlocking !!!
MCC+MNC: 208-10 - USIM
NCK: - Locked - 8
NSCK: - Unlocked - 5
SPCK: - Unlocked - 5
CCK: - Unlocked - 5
PCK: - Unlocked - 5
ESL: - Unlocked - 5
Phone Code: - Empty
Phone Code lock state: - Unlocked
Total call time: 00:32:00
Flip opened times: 0
Radio Band: 900/1800/1900Mhz
EROM Version: R3A016
All Done! - Time:00:00:00
This is what Kulankendi software told me...
The (big) problem with SFR is they ARE supposed to unlock it for free, but they told they just could not get the right unlock code !!!

Now I've read somewhere it was possible to unlock DB2020/CID 49-50-51-52 phones for free using Setool3.
The problem is, to use setool support site, you need a setool box, the site just won't allow downloads without it.
So I don't know where to lay hands on Setool3...

Anyone's got an idea ?

Thanx.