BadFella
Active Level 3
There is a modded file you can install on your watch to make ECG and blood oxygen to work...
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Yes & @Cassidy already posted the links. 

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Ok
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Ameet
Active Level 4
i changed my GW3 CSC to USA. i do have ECG & SpO2 but strangely enough BP doesn't work. on Samsung Health Monitor, on BP tab it says "no compitable watch found"
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Well...I will just leave the BP alone. The BP required calibrate every 30 days. I found that annoying. Getting ECG and SpO2 are good enough. I would say...BP may come in handy if a person needs to check the BP 3 times a day.
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Ameet
Active Level 4
ahh, every 30 days 😳
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You can try using BP Labs to measure your BP. I used it on my S10+ but the S20 Ultra no longer has the sensor. BP Labs is reported to work with Galaxy watches.

The app is available from apk mirror & Galaxy Store. 

Screenshot_20210305_125149.jpg

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it won't work on S21 Ultra
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I said that it doesn't work with my S20 Ultra - Unless you have a Galaxy watch, so it's the same with the S21 series, because there's no senor on the phone. 

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