For those BowMasters who can't decrease your MP to increase your HP, here's a rough guide for you to get it working.

1. Purchase AP Resets from Cash Shop.

2. Use 1 AP Reset to decrease your Str / Dex ONCE.

3. Use the rest of your AP Resets to decrease MP and increase HP.

I've not tried if re-logging into game will stop it from working , if it does , I supposed you could repeat the steps above. After all , AP Resets are cheap