the problem appear if your lcd is not the original one
solution 1 :
replace lcd with original lcd i9205 or i9200 touch will work normally
solution 2 without changing lcd :
1- Root your mobile (CF-Auto-Root-melius3g-melius3gxx-gti9200.zip) via odin or for i9205 search about the compatible root that it is easy
2- install recovery (philz_touch_6.25.0-melius3gxx.tar.rar) via odin
3- install custom rom i use (Simons_9200_Touchwiz_Rom_v211_based_on_BMJ2.zip) via memory card
also there is custom rom for i9205 from Simons search about it
note important :1- Do not disable knox
2- maybe you need update SU via market
3- as i said some model of copy lcd will not work with solution and keep restart until you remove the touch flex from lcd
i think now it is clear and about downgrade with custom rom it will not brick your phone but i will not take any responsibility
all done and enjoy
also maybe some one can make patch for that problem inspiring from that solution
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