I just got my OBD, it is this one:
https://www.aliexpress.com/item/1005003344522246.html?spm=a2g0o.order_list.order_list_main.11.383618025sNkcS
same problem: the password seems to be 1234 and I can't connect it to my DUDU7. The message I get is "Tips> Please enter the PIN code on the mobile phone. The default is 0000. If it has been modified, please check the built-in bluetooth phone settings // Confirm".
So, there is nothing to be done on our side in order to use it directly from DUDU OS? If so, which free app do you recommend using? Also, does it drain the battery if I leave it connected all the time (Land Cruiser Prado from 2004)