Lindvior OBT: Questions to the Staff

i can only answer for orc enchanters although rogues should be the same.

when you had an orc iss enchanter before the update that had poems, harmonies and sonatas enchanted, then after the update your poems, harmonies and sonatas are reset to +0 but are not deleted, you receive immortal scrolls as compensation.
after that you cannot enchant any skill until you awaken into new 4th class.
if you awaken into iss dominator your existing poems, harmonies and sonatas still stay intact, you loose them when you learn any of the new dominator buffs. at this point you won't get any more immortal scrolls, even if you enchanted back your old poems, harmonies and sonatas before exchanging them into new buffs.
this movie shows my unsuccessful tries to receive more immortal scrolls after the update went "live" on pts - https://www.youtube.com/watch?v=b-ldxlffnso

 

how do i do class-change in "125번서버"? only with quests?

 

yes, since the lindvior beta-testing is over, pts is no longer supported as an obt-server and no extra facilities and services are provided.