I found (T230 my mistake) (and) Z200 where the 1900 mhz were disabled by factory (SE) as a request of the cell phone company which buy a large quantity directly.
Q: How can this be fixed again? Is it just software or is it hardware too?
(rebuild security area dont work, I disabled 900 and 1800 and enabled 1900 now phone cant find anything, before it found 900mhz network). Can fighter fix that or do we need original SE equipment?

I have heard of this problem with z200 but I do not know any solution.

T230 is 900/1800 only by hardware- there is no such thing as a T230 with 1900 unfortunately. The USA equivalent is the t237 with 850/1900 or the t226 which is the same with lower quality screen and no speakerphone (unless you flash it to t237 :) )

my mistake, i thought i saw t230 tri band, but not.

bongowireless in canada can fix the z200, he told me the solution to fix the z200 is about 2000 usd, (is that original se equipment?) or just send the z200 to him and it cost only 60.-

Post this on gsmbb.com - I am sure Lead will have something to say about it!