"V" == Vesselinov  writes:

 V> I 'm trying to write something in bulgarian with LaTEX. I use
 V> OT2-encoding but all the commands like \Hard, \hard, \Soft, \soft
 V> etc. do not work. What is wrong?

Please use
\CYRHRDSN instead of \Hard
\cyrhrdsn instead of \hard
\CYRSFTSN instead of \Soft
\cyrsftsn instead of \soft

(look into ot2enc.def for the names of other cyrillic characters)

Here is a full list of ligatures in the OT2 encoding:

You also sould access hard sign as P1 and p1 ligatures, and soft sign
as P0 and p0 ligatures.

You can find a full list of ligatures in OT2 encoding in the following
message:

https://info.vsu.ru/Lists/CyrTeX-en/Message/60.html

Best,
v.