change character correspondence in icu lib

[alxsss]

Hello,

I use
icu4j-49.1.jar,
lucene-analyzers-icu-4.6-SNAPSHOT.jar

for one of the fields in the form 

<filter class="solr.ICUFoldingFilterFactory" />

I need to change one of the accent char's corresponding letter. I made changes 
to this file

lucene/analysis/icu/src/data/utr30/DiacriticFolding.txt

recompiled solr and lucene and replaced the above jars with new ones, but no 
change in the indexing and parsing of keywords.

Any ideas where the appropriate change must be made?

Thanks.
Alex.