this is my first post on topsony. sorry i cannot help with your dead k810 for i have the same problem, but a little different or maybe not.

i have a k810 dead and tried both setool2lite and xs++ 3.1 darwin. cannot read phone with usb cable, instead i used cruiser cable and it reads the phone info fine. i cannot flash fone. i flashed erom with setool2lite and gdfs with xs++ 3.1 but nothing happens.
this is my setool2lite 1.11 log:
Welcome to SEtool2 ( LITE edition ) v 1.11
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.

Will backup GDFS now.
Open COM port OK
ChipID:9900,EMP protocol:0301
Speed:921600
loader prologue returns invalid status
phone pre-boot failed,possible RECOVERY needed.
Elapsed:9 secs.
Open COM port OK
ChipID:9900,EMP protocol:0301
Speed:921600
OTP LOCKED:1 CID:51 PAF:1 IMEI:35799401262693 CERT:N/A
FLASH CID:52 COLOR:RED
ldr_on_ldr payload error (00)
Elapsed:40 secs.

this is my xs++ 3.1 log:
09:51:43| XS++ v3.1 (Darwin) Ready !

09:51:43| Executed on Microsoft Windows XP

09:51:48|

09:51:48| Attempting to open the interface...

09:51:51| Baseband ID: 9900

09:51:51| Protocol Version: 3.1

09:51:52| Speed set to 921600

09:51:52|

09:51:52| Sending db2020_cid01_prodid_p3j.bin...

09:51:53| Applet ID: 070129 0950 NGUCXC1250330_DB2020_PRODUCTIONIDLOADER_P3J

09:51:53| This is a PRODUCTION_ID loader

09:51:53| Activating GDFS...

09:51:54| Phone name detected!

09:51:54| Restarting phone - please wait...

09:52:00| Baseband ID: 9900

09:52:00| Protocol Version: 3.1

09:52:01| Speed set to 921600

09:52:01| Phone has restarted successfully...

09:52:01|

09:52:01| Profiling SEMC phone...

09:52:01| Platform: DB2020

09:52:01| OTP CID: 51

09:52:01| EROM CID: 52

09:52:01| EROM Color: Red

09:52:01| IMEI: 35799401xxxxxx

09:52:01| Phone ID: K810

09:52:01| Region: S_ASIA_LEVAN

09:52:01| CDA: CDA102568/8 R7A

09:52:01| Firmware Version: R8BA024

09:52:01| EROM: n/a

09:52:01| Ready for operation!

09:52:25|

09:52:25| Sending db2020_cid01_prodid_p3j.bin...

09:52:26| Payload: Failed

09:52:26| Sending PRODUCTION_ID LOADER

09:52:26|

09:52:26| Sending db2020_cid01_prodid_r3a.bin...

09:52:35| Error: Flashing failed

09:52:35| Disconnected... Unplug the phone

09:52:40| Shutting down...

i am thinking of replacing the flash ic. will this work? another question how difficult is it to replace flash ic?
i hope there is someone to answer my request.