I used XS++ in the following manner

1) FLASH MAIN R1CA021 from TopSony
2) quit - removed/reinserted battery - started XS++
3) FLASH FS R1CA021 from TopSony
4) quit - removed/reinserted battery - started XS++
5) FINALISE K750 standard CDA pack
6) used breakin - followed 8s/30s prompts to remove/reinsert battery
7) quit XS++
8) removed/reinserted battery and now the phone does not turn on when I press the power button. I can hold C button and get XS++ to recognise the phone

What has gone wrong?

My phone was a K750 CID49 RED with R3A005 EROM
The battery was 100% full before I started
The complete flash process took a few minutes
I have attached the log file here

Thanks
Darren