SEMC (Sony Ericsson Mobile Communications) hardware platforms.
It’s something similar to chipset in PC.DB2000 (another name is Marita) is a GSM+3G(UMTS) capable platform, SE K600/K608/V600/Z800/W900, Sharp 802sh, 902sh, 903sh and LG 3G phones are based on it.DB2010/2012 (Marita compact) is GSM-only, non-3G, platform. Most not very old and modern SE phones like K300,K500,K700,K750,S700,W300,W550,W800,Z520,Z530 are based on this chipset.DB2020 is the newest product of SEMC. K800, K790, K610, Z710 etc, Sharp 904sh feature this most secure (from SE’s point of view) platform.
db2030 is 3G platform, new platform device sonyericsson like W880 & W888

A2:

A2: * Secure boot ROM is used on the access and application side to guarantee the integrity of software at startup. This includes code on all volatile and non-volatile storage. The secure ROM functions can also be used to verify integrity at run-time.
The Real truth story about A2 Platform device

CDA :

This “number” defines which variant of a specific firmware a phone is supposed to have.It lets among others SEUS (Sony Ericsson Update Service) know which language-pack/branding/bandlocks a phone is to be flashed with. A generic (unbranded) K750 for use in Scandinavia will be CDA102337/12, whilst a Telenor-branded K750 will be CDA102338/62. Both will be flashed with the same languages/dictionaries, but the latter will be flashed with Telenor-branded firmware.

CID :

This “number” defines the version of SE’s protection present in the phone.New CIDs are deployed from time to time, for the sole reason of preventing them from beeing unlocked/flashed/tampered with by non-SE service tools. Current CIDs in use by SE are 29/36/37/49. SE-based LG/Sharp phones use the same system (but different versions). The OTP (One Time Programmable memory) and EROM of a phone might be protected by different CIDs, usually the case in newer K600s/K608s.

BLUE/BROWN/RED:

This “color” defines what kind of phone we are dealing with.BLUE phones has been assembled at the factory, but never been programmed with software/GDFS/IMEI (remember kids: the IMEI is stored in the OTP (One Time Programmable memory))BROWN phones are “developer phones”, for testing. Less restrictions are present, as these are used for “debugging/beta” purposes. As of CID36, a phone has to be converted to BROWN to unlock it.RED phones are your typical retail ones.

GDFS:

This is the phones “stash”, where all settings and calibration data is stored (this also goes for the firmwares IMEI-resource as well as the SIMlocks). Similar to other brands use of NVRAM (Non-Viotile Random Access Memory).

IMEI :

International Mobile Equipment Identity.A 15-digit number which includes information on the origin, model, and serial number of the device. The model and origin comprise the initial 8-digit portion of the IMEI, known as the “Type Allocation Code/TAC”. The remainder of the IMEI is manufacturer-defined, with a “Luhn check digit” at the end (which is never transmitted). The “Luhn check digit” is calculated from the rest of the IMEI.
It should be noted that in SE-based phones, the IMEI is stored in two places, the OTP (One Time Programmable memory) and GDFS. The GDFS IMEI is normally read from the OTP, but this can be circumvented by SETool function to “change” the IMEI. This patches the firmware into allowing different OTP/GDFS IMEIs. It is the GDFS IMEI that is reported to the network, so changing this will “de-bar” blocked phones. SEUS is not fooled by this, on the other hand, and it should also be noted that doing this is illegal in most countries.

EMMA :

Service software/solution by SE themselves. Protected by the EMMA smartcard to prevent non-licensed usage. Current version is EMMA3, though EMMA2 is still alive (but kinda useless on newer phones). The EMMA smartcard contains an algorithm that allows EMMA to communicate directly to/with the phones CID, so performing operations the way they were intended. The smartcard and its algorithm has not been cracked. Current EMMA access levels exists:Service Update – Can’t unlock phones.Service Update Pro – Can’t unlock phones.Network Operator – Can’t unlock phones (but sure as hell can lock them ).Service Center Std – Can’t unlock phones.Service Center Rc – Can unlock phones, as they have a special version of the smartcard with a CSCA key.Research & Development – Can unlock phones, as they have a special version of the smartcard with a CSCA key.

first make test point cable, testpoint is +3.3 voltage, connected to specific pin.
we suggesting to use +3.3v battery
(battery ground MUST be connected with phone’s GROUND)

here the picture ( u can use original setool cable)

SETool Test Point

usage:
1. go to emptyboard fill & repair.
2. select any db2020 model.
3. press “TP STAGE #1″. read instructions and execute them.
4. press “TP STAGE #2″. read instructions and execute them.
5. phone is BROWN now.
6. staying on “emptyboard fill and repair” write correct gdfs_in_ssw format.
7. if flashing went fine, flash db2020 erom with needed CID.
8. phone now retail and repaired. fullflash phone as usual.

after SETOOL2 db2020 testpoint procedure phone FULLY working in “alternative security bypass” mode without ANY restrictions.