Well, I have made some progress...Phone finally detected by 8.4 and XS++...Next problem...I have upgraded to latest trough SEUS, wanted to downgrade again to w810_R4CE012_MAIN_GENERIC_HN.bin with XS2++...Now it has stalled at this point for 15mins:
21:38:08| PORT STATUS: ACTIVE
21:38:48| Baseband ID: 8040
21:38:48| Hardware Platform: db2010 Marita compact
21:38:48| Protocol Version: 3.1
21:38:49| +++ Speed set to 921600
21:38:49| Sending loaders\db2010_cid00_prodid_p3k.bin...
21:38:49| This is a PRODUCTION_ID loader
21:38:50| Activating GDFS...
21:38:50| phone name detected
21:38:50| +++ Restarting phone - please wait...
21:38:55| Baseband ID: 8040
21:38:55| Hardware Platform: db2010 Marita compact
21:38:55| Protocol Version: 3.1
21:38:56| +++ Speed set to 921600
21:38:56| +++ Phone has restarted successfully...
21:38:56| ++++++++++++++++++++++++++++++++++
21:38:56| PHONE INFO
21:38:56| ++++++++++++++++++++++++++++++++++
21:38:56| DBID: db2010
21:38:56| OTP CID: 49
21:38:56| EROM CID: 49
21:38:56| EROM color: Red
21:38:56| IMEI: xxxxxxxxxxxxxx
21:38:56| Phone: W810
21:38:56| Operator: EUROPE_4
21:38:56| CDA: CDA102494/87 R3A
21:38:56| Firmware: R4ED001
21:38:56| EROM: n/a
21:38:56| ++++++++++++++++++++++++++++++++++
21:38:56| Ready for operation!
21:39:04| Sending loaders\db2010_cid49red_flash_r2a003.bin...
Ouch...I should have asked in XS++ subforum...Can mod please move it..?