This is a very strange issue :sad:
For me A188 firmware worked fine, I have just burned the first couple of Verbatim ( MKM001 ) DVD+R DL at 4x speed on BTC 1016IM... and without bit-setting or any other tricks.. I can watch movie on stand alone:
Hiunday Divx player/recorder, Keymat Divx, Silvercrest Divx, Irradio Divx, United Divx, HYD Divx, Amstrad Divx, portable 9 inches TFT Divx player.. all mediatek 1389 based.
And also on old Panasonic RV32.. and on newer Sunplus 8281 based player