W904A, currently selling in Singapore, is made to the country specific requirement of Singapore DVB-T2 receiver standard, with the logo
I believe you have noticed that reviews for W905A come from uk. Even though UK is using DVB-T2, there are differences in tuner details which are not shown in product brochures.
Using another example to illustrate my point...In the old CRT tv era, for the same philips tv model, those made for Singapopre is different from those made for Australia and New Zealand. This was because the earth magnetic field in Singapore was different from that in the southern hemisphere. Only insiders knew.
I have not answer your questions completely, but you may want to check out W904A?