VKP - Flash | new FW

Hi,

Since I flashed my K750i (to w800 r1bc002), I cant flash anymore. Of course I use the right ones for w800 fw r1bc002. But Far manager, (using SEFP 0.10.0.51), shows me "Error: Creating dir {00000...**" or similar. Then nothing works anymore. (cant turn on mobile ) - Completely new flashed MAIN & FS. Now everything works.
But VKP Flashs wont work.

Is that the reason that I changed FW ? First I had K750i_R1CA021 (original).

Thanks for all the answers

Pascal