Is it possible?
I only know how it can be done for a named buffer (file). It should be reopened with
++enc=<encoding> option. But an unnamed buffer cannot be reopened.
:set encoding=utf-8 but the text displayed in VIM was still unreadable. Only after I saved the buffer to a file, opened it and reopened it with
:e ++enc=utf-8 it could be read well. However I noticed that there was an error
[ILLEGAL BYTE in line 37]. But I'm happy with that. The main thing is that the contents are readable.
There was no error when I ran
:set encoding=utf-8, but nothing seemed to happen too.