This tutorial on how to disable doram race in emulator or server files located in Trunk/src/char/char.c or Trunk/src/char/char.cpp
Find this code:
#if PACKETVER >= 20151001
if (start_job != JOB_NOVICE && start_job != JOB_SUMMONER)
return -2; // Invalid job
Replace with:
#if PACKETVER >= 20151001
if (start_job != JOB_NOVICE)
return -2; // Invalid job
Then recompile your server.