Help for ROM Fail

[aasterix85]

Hello Mr.PouchX, and I am very sorry for not writing in polish. But this is the only way I can contact with you. I am a big admirer of this forum and you also, and very often I am reading topics with google.translate and learning something new. I think I even begin understanding polish!
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My problem is that I am translating in bulgarian some of the cyrillized firmwares of GPS 72, GPS 60, SummitHC, Vista/LegendHCX and GPSMAP 60CSX. But after translating the text and uploading the firmwares to a GPS and entering in the diagnostic menu it shows ROM Fail. I understand that this problem is caused due to the wrong checksum of the *.rgn but I have no idea how to correct it to be compatible. Here are the original cirillizied firmwares in russian which are NOT making ROM Fail:
Russificator Upd_gps72_230ru_id0247.rar
Russificator Upd_gps72_230ru_id0430.rar
GPS 60RU - 2.40
GPSMAP60CSXRU - 4.00
VIsta/LegendHCXRU 3.10
SummitHCRU2.70

Here are the translated in bulgarian firmwares which annoyingly are making ROM Fail:
gps72_0247_ver2.30BG
gps72_0430_ver2.30BG
GPS 60BG - 2.40
GPSMAP 60CSXBG - 4.00
Vista/LegendBG 3.10
SummitHCBG2.70

Thank you very much,