I suspect that perhaps you will only get complete compatibility if you are brave enough to flash TH 25x7 firmware to your TW 2557. The PCB P/Ns are the same in both firmwares and they even have the same HWID of 1722 which means there are basic hardware similarities [TH has a BT module additionally, but they are probably otherwise identical], but there is never any guarantees when cross-flashing that everything else will work properly. If you want to try it, get the TH version 2.60 from here:
Code:
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TH V2.60 update does contain a new th_TH.glx in the Text folder which is different to the other two supplied by me and fadibomber previously, so you could maybe just try that first to see if it solves your problems: [Only registered and activated users can see links. ]