To those players that got the "Invalid authentication info detected. Returning to title screen". Fear not, you're not banned, just that after the new update(I believe) it seems that there's now a system that flags BA mods. I tried both the mod from PLATINMODS and the mod from ******** with the same problem occuring. Doesn't matter where you got your BA mods from, it will still encounter the same problem.
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What I found out though is that if you already binded your account either with google(unsigned) or Facebook(unsigned) or Nexon(signed) you can still play with your account as long as your playing with the original mod free app that you downloaded at the store. So to those that already binded their account, just download the playstore/appstore version of BA and login from there. To those that did not bind their account, sadly I don't know what to do but hope for you guys that there will be an update to the mod that bypass this without overwriting the guest account.