problems solved:
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well the way i use to change my dedicated server to retake mode is ok, but i find some problems after.
1.i can not change mapgroup to anyother mg_xxxx any more; even if i changed the game_mode&game_type to deathmatch or competitive, the ui hud and some ingame features still remain in retake mode, and i can not switch mapgroup.
2.when i change gamemode back to competitive, command "bot_quota" seems been disabled, and by editing these commands:"mp_retake_ct_count 4;mp_retake_t_count 3;" still i can not change the number of bots. and the respawn position after eachround is no longer at ct/t spawn it's random as it is in retake mode. and i can not bot_add, it says the game is full.
i've tried many ways, but only by restarting the dedicated server, gamemode can go back to normal...
3.the official map voting system is not functional after you tried retakemode once. only by restarting the dedicated server, and be in other gamemode can make it work properly.
4.while playing in retakemode with bots, if i choose ct side druing warmup, when the first round start, server always go crash; to pick t side first is fine, and if i want to play as ct, i have to be spec at the beginning of the first round and then join ct side and take control of a bot.
if anyone finds anything that can help one of these problems, plz let me know... thanks~~~