Bien... me había puesto contenta porque parecía haber llegado al final, pero algo me está faltando.

Me lancé nuevamente a la liberación...
Obviamente primero me dio error:

ChipID:9900,EMP protocol:0301
erom_readvar: error reading unit 0/6
error while reading security units
SECURITY UNITS CAN'T BE READ !
DAMAGED FIRMWARE/GDFS OR EMPTY PHONE
phone pre-boot failed,possible RECOVERY needed.
Elapsed:4 secs

Así que, sin desmoralizarme, nuevamente (creo que por centésima vez!!!), generé el Quick-Patch y volví a la tarea:

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
OTP LOCKED:1 CID:51 PAF:1 IMEI:************** CERT:RED
FLASH CID:52 COLOR:RED
LDR:061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005
Flash ID check:897E
Flash props sent ok

CID52 BYPASS PROCEDURE STARTED
Processing part1...
CSloader version:
070410 1557 HANCXC1250562_DB2020_CSLOADER_R3A009
Processing part2...
Processing part3....
OTP LOCKED:1 CID:51 PAF:1 IMEI:************** CERT:RED
FLASH CID:52 COLOR:RED
LDR:061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005
Flash ID check:897E
Flash props sent ok
REMOVE CABLE FROM PHONE
REMOVE BATTERY FROM PHONE, THEN INSERT IT BACK
THEN PRESS "READY"
Aquí, me tiré a la pileta: debido a todas las anteriores experiencias, desconecté y lo puse a cargar unos 15 minutos (sin encender ni nada) y luego seguí los pasos.

HOLD "C" BUTTON AND ATTACH PHONE

CID52 BYPASS PROCEDURE FINISHED

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
Trying to launch embedded bootloader...
INT LDRB2020_PRELOADER_FOR_SETOOL2
LDRB2020 LOADER FOR SETOOL2
Flash ID check:897E
Flash props sent ok
writing C:\Setool2Lite_v1.10\Liberar\W580_R8BE001_MAIN_GEN ERIC_LA_RED52.mbn
CURRENT FLASH FILE CID:52
SSW uses complete hash, hash len is:9200
Will flash 460 blocks...
SSW loading returns:0
Going to execute VKP script....
Starting to process VKP patch script: C:\Setool2Lite_v1.10\Liberar\quick_access_W580_R8B E001.vkp
VKP script loaded OK. Lines: 1637
Patch structure created OK. Determining blocks to read...
New block #0000 added: $44140000
New block #0001 added: $45BC0000
Blocks selected OK. Reading blocks: 2
Blocks readed to memory OK. Checking contents...
Blocks patched OK. Start writing...
Block 0 written
Block 1 written
VKP script executed OK
Elapsed:2016 secs.

Generé nuevamente el archivo VKP con el SIMLockPatchGen

Going to execute VKP script....
ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
Trying to launch embedded bootloader...
INT LDR:quick access patch by den_po
FLASH CID:52 COLOR:RED
OTP LOCKED:1 CID:51 PAF:1 IMEI:************** CERT:RED
LDRB2020 LOADER FOR SETOOL2
Starting to process VKP patch script: C:\Setool2Lite_v1.10\Liberar\Remove_SIM_lock_W580_ R8BE001_GENERIC.vkp
VKP script loaded OK. Lines: 6
Patch structure created OK. Determining blocks to read...
New block #0000 added: $44600000
Blocks selected OK. Reading blocks: 1
Blocks readed to memory OK. Checking contents...
Blocks patched OK. Start writing...
Block 0 written
VKP script executed OK
Elapsed:12 secs.

Ahora... no sé si debo hacer algo más puesto que, haciendo un IDENTIFY me tira el siguiente log:

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
Flash ID check:897E
Flash props sent ok
OTP LOCKED:1 CID:51 PAF:1 IMEI:**************CERT:RED
FLASH CID:52 COLOR:RED

Model:W580i
Brand:Sony Ericsson
MAPP CXC article: R8BE001 prgCXC1123362_GENERIC_LA
MAPP CXC version: R8BE001
Language Package:AMERICA_2
CDA article: CDA102568/107
CDA version: R8A
Default article: cxc1123364
Default version: R8BE001

Network LOCKED
Operator: 722-31

Elapsed:5 secs.
O sea... aún está bloqueado?... qué hago? qué me falta?
Gracias