Ok, ya descarge estos 2 archivos (K790_R8BF003_MAIN_GENERIC_EV_RED52.mbn y quick_access_K790_R8BF003_GENERIC.vkp) y lo aplique como dice el manual Aplicar_quick_access_patch
pero me mando este log y al final un error:

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 Index of ./ and buy FULL.

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:52
Speed:921600
OTP LOCKED:1 CID:49 PAF:1 IMEI:35220801042453 CERT:RED
FLASH CID:52 COLOR:RED
LDR:061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005
Flash ID check:897E
Flash props sent ok
writing C:\Documents and Settings\PANDA\My Documents\Mis archivos recibidos\Sonyericsson K790\K790_R8BF003_MAIN_GENERIC_EV_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....
Enable alternative security bypass !!!
Starting to process VKP patch script: C:\Documents and Settings\PANDA\My Documents\Mis archivos recibidos\Sonyericsson K790\quick_access_K790_R8BF003_GENERIC.vkp
VKP script loaded OK. Lines: 1637
Patch structure created OK. Determining blocks to read...
New block #0000 added: $44140000
New block #0001 added: $45B00000
Blocks selected OK. Reading blocks: 2
Block @ $44140000 read error. Have only: 00000000 bytes
Elapsed:354 secs.