I Think this Version 1.2 is Unique only for that Provider but it must be the same Datasheet like for the Version
1.1 and for Sure there must be somwhere Uart on Chip
DS-1725-COS-1.2
This is maybe just one Step Forward and the Manufacturer is Known. Evrything else Depends on who is Willing to try Contact Them and what Info you get from them
Evrything is Possible with Infos that are Needed