German T-Mobile Lumia 920 can't install Pro Cam.

Along similar lines since your phone was branded "German T-Mobile" variant. Try changing your region to german and see if it works.

Hold on.. I don't get it..
059R4W6 - Global black swap is a variant of german T-Mobile?
or is it a global ROM (no CV/unbranded)?

Does anyone already change to this ROM?

I have Lumia 920 RM-820 AT&T and I just want a ROM unbranded
 
Hold on.. I don't get it..
059R4W6 - Global black swap is a variant of german T-Mobile?
or is it a global ROM (no CV/unbranded)?

Does anyone already change to this ROM?

I have Lumia 920 RM-820 AT&T and I just want a ROM unbranded

Mine is a Black RM-821 Lumia 920 with german T-Mobile ROM.

Consider looking for Product Codes here.

And ALWAYS follow a tutorial to change the ROM.
 

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