I have W850i too & it gives the same symtoms. I have flashed it with SETool2lt and it seems to flash successfully. But still cant start the phone. Help is appreciated. I note there is a line SSW returns 0. Is this the cause? And how to resolve this?

Welcome to SEtool2 ( LITE edition ) v 1.10
supported DB2010/DB2012 CID49/50/51/52, DB2020 CID49/51/52
Loaded 51 flash descriptors

if you like LITE edition - please visit http://www.setool.net and buy FULL.

FILE RECOGNIZED AS CUSTOMIZATION PACKAGE.

CDA:CDA102677/98
MODEL:W850i
VARIANT:APAC
LANGUAGE: EN
LANGUAGE: MS
LANGUAGE: ID
LANGUAGE: TL
LANGUAGE: VI
LANGUAGE: ZS

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:49
Speed:921600
OTP LOCKED:1 CID:49 PAF:1 IMEI:35282601310038 CERT:RED
FLASH CID:49 COLOR:RED
LDR:061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005
Flash ID check:897E
Flash props sent ok
writing C:\Documents and Settings\Acer\Desktop\DownloadsW850\W850_R1ED001_M AIN_GENERIC_CY_RED49.mbn
CURRENT FLASH FILE CID:49
SSW uses complete hash, hash len is:9100
Will flash 455 blocks...
SSW loading returns:0
writing C:\Documents and Settings\Acer\Desktop\DownloadsW850\W850_R1ED001_F S_APAC_RED49.fbn
CURRENT FLASH FILE CID:49
SSW uses complete hash, hash len is:5060
Will flash 253 blocks...
SSW loading returns:0
CSloader version:
070410 1557 HANCXC1250562_DB2020_CSLOADER_R3A009
loader startup: executed
loader filesystem startup: executed
loader GDFS startup: executed
Writing package...
Directory: tpa/preset/custom/
CONTENT_DOWNLOAD_HOOK.itm (10240)
Customize.xml (2855)
FM_PICTURES_HOOK_3.itm (10240)
FM_SOUNDS_HOOK_3.itm (10240)
FM_THEMES_HOOK_3.itm (10240)
FM_VIDEOS_HOOK_3.itm (10240)
GAMES_HOOK_3.itm (10240)
MEDIA_PLAYER_HOOK_3.itm (10240)
ORG_APPLICATIONS_HOOK_3.itm (10240)
Picture_Generic Trade ID_4522.1.jpg (28784)
preloaded_config.xml (100174)
SETT_RINGTONE_HOOK_1.itm (10240)
SETT_SCREENSAVER_HOOK_1.itm (10240)
SETT_STARTSHOW_HOOK_1.itm (10240)
SETT_WALLPAPER_HOOK_1.itm (10240)
Sound_Generic Trade ID_4523.1.mp3 (125388)
VIDEO_PLAYER_HOOK_1.itm (10240)
Phone detached
Elapsed:436 secs.