Can someone get his previous credits counted in a new Master's programme in the EU? Suppose, someone studied in a 120ECTS MSc program in CS in a country 'X' in the EU. He obtained 60 ECTS there, but he also has some failed courses. He then abandons the program.
Now, he moves to a country 'Y' in the EU and gets admission to program CS in the country 'Y' after 5 years.
Can he get his 60 ECTS credits counted by the school offering CS?
They will decide what credits / courses they will be prepared to accept.
All you can do is show what you have covered so far, even including syllabi may help make a case but, remember they get to decide what is accepted.