I flashed the phone with the files suggested here, also with the custpack. Everything went like it should.
The phone is Europe 3 now, but when I start it up I get "insert correct sim card".
I did a long search on the forum, but it didn't help me.
Here's the xs++ log:
00:16:45| XS++ v3.1 (Darwin) Ready !

00:16:45| Executed on Microsoft Windows XP

00:16:55|

00:16:55| Attempting to open the interface...

00:16:55|

00:16:55| TURN OFF PHONE!

00:16:55| Hold 'C' button on phone and connect phone NOW.

00:16:55| You have 30 seconds...

00:16:55|

00:17:00| Baseband ID: 9900

00:17:00| Protocol Version: 3.1

00:17:00| Warning: IMEI name does not match GDFS name (IMEI:NULL GDFS:W580)

00:17:00| ...using GDFS name

00:17:00|

00:17:00| Profiling SEMC phone...

00:17:00| Platform: DB2020

00:17:00| OTP CID: 51

00:17:00| EROM CID: 52

00:17:00| EROM Color: Red

00:17:00| IMEI:

00:17:00| Phone ID: W580

00:17:00| Region: EUROPE_1

00:17:00| CDA: CDA12345678/123 R2A

00:17:00| Firmware Version: R8BE001

00:17:00| EROM: R3A022

00:17:00| Ready for operation!

00:17:37| ~~~~~~~~~~ Custpack information ~~~~~~~~~~

00:17:37| Custpack: AMERICA_2 (CDA102460/101) (K510)

00:17:37| Generic(non-branded) custpack: Yes

00:17:37| Allowed languages: en, pb, xl,

00:17:37| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

00:17:48|

00:17:48| Sending db2020_cid01_prodid_p3j.bin...

00:17:48| Applet ID: 070129 0950 NGUCXC1250330_DB2020_PRODUCTIONIDLOADER_P3J

00:17:48| This is a PRODUCTION_ID loader

00:17:48|

00:17:48| Sending db2020_mem_patcher_cid52_r2a006.bin...

00:17:48| Applet ID: 061205 1523 HANCXC9876543210_DB2020_MEM_PATCHER_R2A006 0

00:17:48| This is a MEM_PATCHER loader

00:17:48|

00:17:48| Sending db2020_cid52red_flash_r2a005.bin...

00:17:49| Applet ID: 061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005

00:17:49| This is a FLASH loader

00:17:49| Now flashing firmware main...

00:17:53| Flashing c:\documents and settings\karen\bureaublad\firmware\w580_r8be001_ma in_generic_la_red52\w580_r8be001_main_generic_la_r ed52.mbn

00:17:53| Header type: BABE

00:17:53| 460 flashblocks

00:21:44| Finishing flash

00:21:45| Done flashing

00:21:45| Now flashing filesystem...

00:21:47| Flashing c:\documents and settings\karen\bureaublad\firmware\w580_r8be001_fs _europe_3_red52\w580_r8be001_fs_europe_3_red52.fbn

00:21:47| Header type: BABE

00:21:47| 213 flashblocks

00:23:34| Finishing flash

00:23:35| Done flashing

00:23:35|

00:23:35| Sending db2020_red52_cs_r3a009.bin...

00:23:36| Applet ID: 070410 1557 HANCXC1250562_DB2020_CSLOADER_R3A009

00:23:36| This is a CHIPSELECT loader

00:23:36| Activating loader...

00:23:36| Activating GDFS...

00:23:58| This loader is UNLOCKED

00:23:58| Success! CS-loader has been unlocked!

00:23:58| Uploading customization files to phone...

00:23:59| Upload ./own_custpack/tpa/preset/custom/CONTENT_DOWNLOAD_HOOK.itm to tpa/preset/custom/CONTENT_DOWNLOAD_HOOK.itm

00:23:59| Activating filesystem

00:24:33| Creating directory tpa

00:24:33| Creating directory tpa/preset

00:24:33| Creating directory tpa/preset/custom

00:24:33| Deleting file tpa/preset/custom/CONTENT_DOWNLOAD_HOOK.itm

00:24:33| Deleted...OK!

00:24:33| Uploading file tpa/preset/custom/CONTENT_DOWNLOAD_HOOK.itm

00:24:33| Done uploading

00:24:33| Upload ./own_custpack/tpa/preset/custom/Customize.xml to tpa/preset/custom/Customize.xml

00:24:33| Creating directory tpa

00:24:33| Creating directory tpa/preset

00:24:33| Creating directory tpa/preset/custom

00:24:33| Deleting file tpa/preset/custom/Customize.xml

00:24:33| Deleted...OK!

00:24:33| Uploading file tpa/preset/custom/Customize.xml

00:24:33| Done uploading

00:24:33| Upload ./own_custpack/tpa/preset/custom/FM_PICTURES_HOOK_3.itm to tpa/preset/custom/FM_PICTURES_HOOK_3.itm

00:24:33| Creating directory tpa

00:24:33| Creating directory tpa/preset

00:24:33| Creating directory tpa/preset/custom

00:24:33| Deleting file tpa/preset/custom/FM_PICTURES_HOOK_3.itm

00:24:33| Deleted...OK!

00:24:33| Uploading file tpa/preset/custom/FM_PICTURES_HOOK_3.itm

00:24:33| Done uploading

00:24:33| Upload ./own_custpack/tpa/preset/custom/FM_SOUNDS_HOOK_3.itm to tpa/preset/custom/FM_SOUNDS_HOOK_3.itm

00:24:33| Creating directory tpa

00:24:33| Creating directory tpa/preset

00:24:33| Creating directory tpa/preset/custom

00:24:33| Deleting file tpa/preset/custom/FM_SOUNDS_HOOK_3.itm

00:24:33| Deleted...OK!

00:24:33| Uploading file tpa/preset/custom/FM_SOUNDS_HOOK_3.itm

00:24:33| Done uploading

00:24:33| Upload ./own_custpack/tpa/preset/custom/FM_THEMES_HOOK_3.itm to tpa/preset/custom/FM_THEMES_HOOK_3.itm

00:24:33| Creating directory tpa

00:24:33| Creating directory tpa/preset

00:24:33| Creating directory tpa/preset/custom

00:24:33| Deleting file tpa/preset/custom/FM_THEMES_HOOK_3.itm

00:24:33| Deleted...OK!

00:24:33| Uploading file tpa/preset/custom/FM_THEMES_HOOK_3.itm

00:24:35| Done uploading

00:24:35| Upload ./own_custpack/tpa/preset/custom/FM_VIDEOS_HOOK_3.itm to tpa/preset/custom/FM_VIDEOS_HOOK_3.itm

00:24:35| Creating directory tpa

00:24:36| Creating directory tpa/preset

00:24:36| Creating directory tpa/preset/custom

00:24:36| Deleting file tpa/preset/custom/FM_VIDEOS_HOOK_3.itm

00:24:36| Deleted...OK!

00:24:36| Uploading file tpa/preset/custom/FM_VIDEOS_HOOK_3.itm

00:24:36| Done uploading

00:24:36| Upload ./own_custpack/tpa/preset/custom/GAMES_HOOK_3.itm to tpa/preset/custom/GAMES_HOOK_3.itm

00:24:36| Creating directory tpa

00:24:36| Creating directory tpa/preset

00:24:36| Creating directory tpa/preset/custom

00:24:36| Deleting file tpa/preset/custom/GAMES_HOOK_3.itm

00:24:36| Deleted...OK!

00:24:36| Uploading file tpa/preset/custom/GAMES_HOOK_3.itm

00:24:36| Done uploading

00:24:36| Upload ./own_custpack/tpa/preset/custom/MEDIA_PLAYER_HOOK_3.itm to tpa/preset/custom/MEDIA_PLAYER_HOOK_3.itm

00:24:36| Creating directory tpa

00:24:36| Creating directory tpa/preset

00:24:36| Creating directory tpa/preset/custom

00:24:36| Deleting file tpa/preset/custom/MEDIA_PLAYER_HOOK_3.itm

00:24:36| Deleted...OK!

00:24:36| Uploading file tpa/preset/custom/MEDIA_PLAYER_HOOK_3.itm

00:24:36| Done uploading

00:24:36| Upload ./own_custpack/tpa/preset/custom/ORG_APPLICATIONS_HOOK_3.itm to tpa/preset/custom/ORG_APPLICATIONS_HOOK_3.itm

00:24:36| Creating directory tpa

00:24:36| Creating directory tpa/preset

00:24:36| Creating directory tpa/preset/custom

00:24:36| Deleting file tpa/preset/custom/ORG_APPLICATIONS_HOOK_3.itm

00:24:36| Deleted...OK!

00:24:36| Uploading file tpa/preset/custom/ORG_APPLICATIONS_HOOK_3.itm

00:24:36| Done uploading

00:24:36| Upload ./own_custpack/tpa/preset/custom/preloaded_config.xml to tpa/preset/custom/preloaded_config.xml

00:24:36| Creating directory tpa

00:24:37| Creating directory tpa/preset

00:24:37| Creating directory tpa/preset/custom

00:24:37| Deleting file tpa/preset/custom/preloaded_config.xml

00:24:37| Deleted...OK!

00:24:37| Uploading file tpa/preset/custom/preloaded_config.xml

00:24:38| Done uploading

00:24:38| Upload ./own_custpack/tpa/preset/custom/SETT_RINGTONE_HOOK_1.itm to tpa/preset/custom/SETT_RINGTONE_HOOK_1.itm

00:24:38| Creating directory tpa

00:24:38| Creating directory tpa/preset

00:24:38| Creating directory tpa/preset/custom

00:24:38| Deleting file tpa/preset/custom/SETT_RINGTONE_HOOK_1.itm

00:24:38| Deleted...OK!

00:24:38| Uploading file tpa/preset/custom/SETT_RINGTONE_HOOK_1.itm

00:24:39| Done uploading

00:24:39| Upload ./own_custpack/tpa/preset/custom/SETT_SCREENSAVER_HOOK_1.itm to tpa/preset/custom/SETT_SCREENSAVER_HOOK_1.itm

00:24:39| Creating directory tpa

00:24:39| Creating directory tpa/preset

00:24:39| Creating directory tpa/preset/custom

00:24:39| Deleting file tpa/preset/custom/SETT_SCREENSAVER_HOOK_1.itm

00:24:39| Deleted...OK!

00:24:39| Uploading file tpa/preset/custom/SETT_SCREENSAVER_HOOK_1.itm

00:24:40| Done uploading

00:24:40| Upload ./own_custpack/tpa/preset/custom/SETT_STARTSHOW_HOOK_1.itm to tpa/preset/custom/SETT_STARTSHOW_HOOK_1.itm

00:24:40| Creating directory tpa

00:24:40| Creating directory tpa/preset

00:24:40| Creating directory tpa/preset/custom

00:24:40| Deleting file tpa/preset/custom/SETT_STARTSHOW_HOOK_1.itm

00:24:40| Deleted...OK!

00:24:40| Uploading file tpa/preset/custom/SETT_STARTSHOW_HOOK_1.itm

00:24:40| Done uploading

00:24:40| Upload ./own_custpack/tpa/preset/custom/SETT_WALLPAPER_HOOK_1.itm to tpa/preset/custom/SETT_WALLPAPER_HOOK_1.itm

00:24:40| Creating directory tpa

00:24:40| Creating directory tpa/preset

00:24:40| Creating directory tpa/preset/custom

00:24:40| Deleting file tpa/preset/custom/SETT_WALLPAPER_HOOK_1.itm

00:24:40| Deleted...OK!

00:24:40| Uploading file tpa/preset/custom/SETT_WALLPAPER_HOOK_1.itm

00:24:40| Done uploading

00:24:40| Upload ./own_custpack/tpa/preset/custom/VIDEO_PLAYER_HOOK_1.itm to tpa/preset/custom/VIDEO_PLAYER_HOOK_1.itm

00:24:40| Creating directory tpa

00:24:40| Creating directory tpa/preset

00:24:40| Creating directory tpa/preset/custom

00:24:40| Deleting file tpa/preset/custom/VIDEO_PLAYER_HOOK_1.itm

00:24:40| Deleted...OK!

00:24:40| Uploading file tpa/preset/custom/VIDEO_PLAYER_HOOK_1.itm

00:24:40| Done uploading

00:24:40| Uploading /files_to_upload to phone...

00:24:40| Sending shutdown command to phone...

00:24:40| Customizing was SUCCESSFUL!

00:24:40| Disconnecting phone...

00:24:40| You may now unplug your phone.

00:24:40| Flashing was successful

00:24:42| Disconnected... Unplug the phone

00:37:35|

00:37:35| Attempting to open the interface...

00:37:35|

00:37:35| TURN OFF PHONE!

00:37:35| Hold 'C' button on phone and connect phone NOW.

00:37:35| You have 30 seconds...

00:37:35|

00:37:39| Baseband ID: 9900

00:37:39| Protocol Version: 3.1

00:37:39| Warning: IMEI name does not match GDFS name (IMEI:NULL GDFS:W580)

00:37:39| ...using GDFS name

00:37:39|

00:37:39| Profiling SEMC phone...

00:37:39| Platform: DB2020

00:37:39| OTP CID: 51

00:37:39| EROM CID: 52

00:37:39| EROM Color: Red

00:37:39| IMEI:

00:37:39| Phone ID: W580

00:37:39| Region: EUROPE_3

00:37:40| CDA: CDA102568/12 R8A

00:37:40| Firmware Version: R8BE001

00:37:40| EROM: R3A022

00:37:40| Ready for operation!

00:38:11| After making any changes with FSX

00:38:11| you must press the 'Shutdown' button

00:38:27|

00:38:27| Sending db2020_cid01_prodid_p3j.bin...

00:38:27| Applet ID: 070129 0950 NGUCXC1250330_DB2020_PRODUCTIONIDLOADER_P3J

00:38:27| This is a PRODUCTION_ID loader

00:38:27|

00:38:27| Sending db2020_mem_patcher_cid52_r2a006.bin...

00:38:28| Applet ID: 061205 1523 HANCXC9876543210_DB2020_MEM_PATCHER_R2A006 0

00:38:28| This is a MEM_PATCHER loader

00:38:28|

00:38:28| Sending db2020_cid52red_flash_r2a005.bin...

00:38:28| Applet ID: 061201 1314 HANCXC1329129_DB2020_FLASHLOADER_R2A005

00:38:28| This is a FLASH loader

00:38:28| Sendinging shutdown signal to phone...

00:38:28| Done.. You may now connect again...

00:38:28| Shutting down...