Solved, thanks again for recommending that forum to me.

Thanks for pointing to it, Holsten. It is very kind from you to care for my problem.

So far I tried a local Hungarian and 3 forum sites of English language, but unsuccesfully.

This Polish site seems to be quite promising.

No problem, I did it indeed, and it was my fault not to emphasize that I was looking for a different version, not the “Russificated” one. I guess someone here around used a tool to modify the original 4.20 years ago in order to make it able to display the Russian characters. Is this tool available? ...

Dear Holsten, As I wrote in May finally the whole update process worked me using the file in the link you kindly offered to me. But it was only today that I realized that this version of 4.20 is some sort of Russian version, because all the special Hungarian characters with accents like ö, ü, ű, ú e...

Thanks a lot, Holsten, I do appreaciate it. It worked. So Garmin support tried to mislead me again saying that 4.00 foundable on their website is the same as the 4.20 you kindly provided for me. Updater.exe allowed me to re-install this 4.20 and overwrote the original 4.20. Then I made the patch rep...

Dear Users, First I am really sorry that my knowledge of Russian is so limited that I have to use English here. I had had a 60csx with sirfstar chipset inside, but this unit has died some weeks ago. I was lucky and I could get another 60csx, a used one of course, but with a mediatek chipset inside. ...