I have not seen any sign of dual frequency on the Lenovo Z6 Youth, and just received this answer about it. I don't know what to do. Just wait for software updates?
"As per your requirement,we checked with our product team and confirmed this phone has dual frequency signals function.
There is no need to set.
The dual-frequency Beidou positioning system depends on the software, some software supports, some software does not,could you please kindly try more softwares?"
"And according to this GPS World article, the Z6 Youth Edition will use the Allystar HD8040 series chipset and claims sub-meter accuracy, as well as being the first to support dual-frequency for Beidou using the new BDS phase III signal B2a.
However, screenshots from the Z6 Youth Edition (with 11.0.049 ST Android 9) tell a different story — no L5 or E5a satellites are visible!

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I sent several screenshots but I did not comment on the double id #s. But I said it's only showing L1, E1, B1C, & no L5, E5a, nor B3. But it's pretty apperent it's mislabelling the satellites. Also, what is strange is that it shows the same altitude for ellipsoid and MSL. When the horizontal position error said 3.1 feet (vertical always says 0.0), the altitude seemed to vary only 30 feet, which is better than what I've seen before.
Lenovo Z6 Youth Edition could launch as K10 Note outside China
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Mattia Ballerini sei riuscito a risolvere il problema No GPS ??