just left my device in my home and i just tested it… however i mapped player 1&2 with different controller but they directed to the same set of buttons, and tried in game play and confirm they used the same button… cause i can control both players in one controller… so now the issue is:
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icade mode is working fine in retroarch, but only single player, the second controller used the same set of reactions button with the first one,
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bt keyboard mode is working fine in IOS (can use it to type words) but could not work in retroarch, i used this mode in another emu app Snes9x and it works perfectly with two controllers, so that must be the setting problem of retroarch,