HELP??? K800i freezes

Hallo,
I need help to repair my K800i. The K800i freezes, when I turn it on everything works but it freezes 30seconds later and you can do nothing about it only battary remove turns the phone off. I tried many things, like flashing main+fs +custom: flashing with k810i and so on. and all is the same the phone freezes, but when after turning the phone on i play music it doesn't freez and when i turn the music off the phone freezes again. And there is one more situation where it doesn't freeze , its when i connect the phone to the computer.

Please help what can I do with the phone?

maybe you can try flashing using SEUS

and what did you do the last time before it goes like this?

maybe you can try flashing using SEUS

Flashing Wont Help You.
Do One Thing.
Flash Using Old Firmware Via SEUS (Reply If You Want Method)
Then Upgrade You EROM Via Downloading Wotan Client From Online de-branding and software upgrade service SonyEricsson (SE) mobile phones | WotanServer.com
Let Wotan Update. Then Clear Login And Pass And Press Start.
Next Attach Your Phone By Pressing 2+5 Keys Instead Of c.
Let It Update Your EROM.
This Will Take 11 Seconds.
Now Update Your Firmware Using Legal Method, i.e SEUS.
Although This Take About Haf An Hour But Will 100% Run Your Phone Smoothly.
Guranteed

just flash firmware and main with xs++3.1, and it should work

here is the LOG
15:46:19| Baseband ID: 9900
15:46:19| Hardware Platform: db2020
15:46:19| Protocol Version: 3.1
15:46:19| Phone name detected!
15:46:19|
15:46:19| Profiling SEMC phone...
15:46:19| Baseband ID: db2020
15:46:19| OTP CID: 49
15:46:19| EROM CID: 52
15:46:19| EROM Color: Red
15:46:19| IMEI: 35170801xxxxxx
15:46:19| Phone ID: K800
15:46:19| Network: EUROPE_2
15:46:19| CDA: CDA102568/11 R6A
15:46:19| Firmware Version: R1KG001
15:46:19| EROM: R3A016
15:46:19|
15:46:19| Ready for operation!

The phone has already the new EROM
And when I try tu upgrade it via davinci
it shows me:

Detected SonyEricsson: K800/K610/Z710/K790/W850.
Phone Color: Red
Phone CID: 52
Status Ok, OTP Close, CID49, PAF1
IMEI: 351708-01-935324
Phone EROM: R3A016 prgCXC1250461_EROM_DB2020_WILMA_FOTA_SIMLOCK_FLAFL A_SIBLEY_SEMCUSB
Status Ok, OTP Close, CID49, PAF1
IMEI: 351708-01-935324
Erom Update started...
Erom Update failed!
Execution Time - 00:00:13
Error: 0x006666

How I told I already have tried everything with flashing (via SEUS, via XS++ ...)

Here I tried to upgrade the erom:
WotanClient 1.0.2
RUNNING UPDATE
FTP: connecting to server eagle.wotanserver.com
FTP: connecting to server
FTP: downloading - please wait
FTP: close
ZIP: unpacking data...
ZIP: done
UPDATE FINISHED
Connect your phone, pressing "C"
waiting...
phone found.
phone found at position 1
DB2020 detected
CL00 CI00 OCI00 __ __ __ SL00 OCL00 __
LOADER: OK
061220 1711 NPA4_CXC1329130_DB2020_SEMC_RECOVERY_P3K
FC ID: 89 7E
connecting to server
connection OK
sending login
EROM: starting upgrade
EROM: done
ERROR:
SEMCSEC status 3
== FAILED ==
Duration: 00:01

u can flash the erom with xs++ guide here Upgrading or repairing the EROM (FOTA) in phones CID 49 or CID 51 with Phone XS - Top Sony Forums,
after flashing the erom u will need to do a full flash main fs & custpack

You havent to reflash the main etc. when u only upgrade the erom .but i think that a erom update cant help u ( but please try it out anyway)