Conseguí hacerlo, pero solo seleccionando otro modelo. No se porque no me deja con el mio.

Por si os sirve, os lo dejo aquí. Sino, seguiré intentándolo.

Código:
Welcome to SEtool2 ( LITE edition ) v 1.11
supported DB2010/DB2012 CID49/50/51/52, DB2020 CID49/51/52
Loaded 51 flash descriptors
 
if you like LITE edition - please visit www.setool.net and buy FULL.
 
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:35988601996729 CERT:RED
FLASH CID:52 COLOR:RED
 
Model:W580i
Brand:movistar
MAPP CXC article: R6BC002     prgCXC1123362_GENERIC_LA
MAPP CXC version: R6BC002
Language Package:TELEF_GEN
CDA article: CDA102774/84
CDA version: R8A
Default article: cxc1123364
Default version: R6BC002
 
Network LOCKED
Operator: MULTIPLE
 
Elapsed:2 secs.