Hi satch,
I did the firmware flash with the files u have sent using omnius but network problem persists.
Here is the activity log for your perusal.

Action journal
04:13:42 . The action name is 'Flash'
04:13:42 Selected phone type: C905
04:13:42 Selected connection method: USB EROM
04:13:53 Connecting via SEMC USB Flash Device (USB3)...
04:13:53 Device driver version: 2.2.0.5
04:13:53 Entering baseband CPU service mode...
04:13:53 Detected chipset: DB3210 'E800
04:13:54 Boot mode: EROM
04:13:54 IMEI: 3520*****
04:13:54 OTP CID: 52
04:13:54 OTP area status: Locked
04:13:54 Product type: Retail
04:13:54 Effective color: Red
04:14:12 NAND flash chip ID: 002C-00AA
04:14:12 Sending loader...
04:14:14 Waiting for flash files to load...
04:14:20 Writing file C905i_1205-9079_Generic_R1BA034_Red52.a2sw...
04:17:11 Final verification...
04:17:24 Writing file C905i_1205-9083_WestEurope_R1BA034_Red52.a2fs...
04:20:54 Final verification...
04:21:10 Starting file system...
04:21:14 Language variant: WESTERN-EUROPE
04:21:14 CDA number: 1209-4774
04:21:14 CDA revision: R6A
04:21:14 Operator: Sony Ericsson
04:21:14 Country: Sweden
04:21:14 Writing file /tpa/preset/custom/Customize.xml...
04:21:15 Writing file /tpa/preset/custom/CONTENT_DOWNLOAD_HOOK.itm...
04:21:15 Writing file /tpa/preset/custom/FM_PICTURES_HOOK_3.itm...
04:21:15 Writing file /tpa/preset/custom/FM_SOUNDS_HOOK_3.itm...
04:21:15 Writing file /tpa/preset/custom/FM_THEMES_HOOK_3.itm...
04:21:15 Writing file /tpa/preset/custom/FM_VIDEOS_HOOK_3.itm...
04:21:15 Writing file /tpa/preset/custom/GAMES_HOOK_3.itm...
04:21:16 Writing file /tpa/preset/custom/MC_MUSIC_HOOK_3.itm...
04:21:16 Writing file /tpa/preset/custom/MC_PHOTO_HOOK_3.itm...
04:21:16 Writing file /tpa/preset/custom/MC_VIDEO_HOOK_3.itm...
04:21:16 Writing file /tpa/preset/custom/ORG_APPLICATIONS_HOOK_3.itm...
04:21:16 Writing file /tpa/preset/custom/preloaded_config.xml...
04:21:20 Writing file /tpa/preset/custom/SETT_RINGTONE_HOOK_1.itm...
04:21:20 Writing file /tpa/preset/custom/SETT_SCREENSAVER_HOOK_1.itm...
04:21:20 Writing file /tpa/preset/custom/SETT_STARTSHOW_HOOK_1.itm...
04:21:20 Writing file /tpa/preset/custom/SETT_WALLPAPER_HOOK_1.itm...
04:21:21 Initializing GDFS access...
04:21:21 Turning off the phone...
04:21:23 i Please disconnect battery and cable from the phone!
04:21:23 s Successfully done.
04:21:23 . The action entered shutdown phase
04:21:23 . The action reported success


Additional details
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Regards
Amit