Good luck... In France we have no BP, no ECG and no SPO2.
Samsung never communicate. Totally ***** customer support honestly.
Many watches even at a very low price offer spo2/vo2max. Xiaomi will release one in the next few months at 1/3rd of the price of GW3.
For any other brand, it takes 4-5 months to get an approval for this kind of feature.
But for samsung things seem to be different, Galaxy Active2 has been waiting forever.
Check youtube, it's really simple to sideload ecg & bp straight from an android phone. No rooting & literally takes 2 minutes. I'm in UK & now have full functionality.