Downgrade cid49 k750i R1DB001 to R1CA021

I took my phone back from a S.E. service point and they had upgraded it to R1DB001.

I'm flashing R1CA021 fs (emea 3) & main with XS++ but the phone still shows as R1DB001.
Customisation then goes

Code:

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Cannot open breakinfirm\K750_R1DB001.bin
Your firmware doesn't exists in our library.You'll need to reflash your mainfirmware.Done flashing

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I've tried reflash main again but same story.

Has anyone else had that?

Try to bruteforce it...

more than brutforce, try to upload customize.xml using FAR menager with newest SEFP plugin 10.0.51 v4,
its easy and quick.
before don`t forget flash correct ssw file using XS ;)

Thanks for your answers guys, I got it working by going to R1BC002 first then went smoothly into R1CA021.

Somebody have the FS W800_R1BC002_FS_EMEA1 to share????

does anybody know a tutorial for xs++?