EDIT: Just an update, it's becoming clear that we need more serial number info than just the first 3 digits, as these number only indicate the model, not the batch. Please provide additional serial number info.
536 = f5 slate with black band
537 = f5 silver with blue band
538 = f5 slate with yellow band
53A = f5 Sapphire
53B = f5 Sapphire slate grey with metal band53C = f5 Sapphire slate grey with metal band
568 = f5S
56D = f5S
Let's collect as much info as we can to see if connectivity issues are related to specific models, serial number batches or paired phones. Here's a start from the info on the beta thread:
[TABLE="class: grid, width: 1000"]
[TR]
[TD]#[/TD]
[TD]Model[/TD]
[TD]Region[/TD]
[TD]Serial Number[/TD]
[TD]FW[/TD]
[TD]GPS Issues[/TD]
[TD]ANT/ANT+ Issues[/TD]
[TD]BT Issues[/TD]
[TD]WiFi Issues[/TD]
[TD]Phone[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]f5 slate[/TD]
[TD]USA[/TD]
[TD]538003419[/TD]
[TD]3.44[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]f5[/TD]
[TD][/TD]
[TD]536019349[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]f5[/TD]
[TD]EU[/TD]
[TD]536000172[/TD]
[TD]3.41[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]drops 5m[/TD]
[TD]N/A[/TD]
[TD]Sony Xperia Z1 Compact[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53C001..[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]S7 Edge[/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]f5[/TD]
[TD][/TD]
[TD]53A...[/TD]
[TD]3.30[/TD]
[TD][/TD]
[TD][/TD]
[TD]none[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD]f5 slate[/TD]
[TD]EU[/TD]
[TD]5360025..[/TD]
[TD]4.02[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD]N/A[/TD]
[/TR]
[TR]
[TD]7[/TD]
[TD]f5s Sapp[/TD]
[TD][/TD]
[TD]56D0004..[/TD]
[TD]3,30[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]HTC ONE M7[/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]39...(?)[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]9[/TD]
[TD]f5[/TD]
[TD][/TD]
[TD]53A00...[/TD]
[TD]3.44[/TD]
[TD][/TD]
[TD][/TD]
[TD]none[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]10[/TD]
[TD]f5[/TD]
[TD][/TD]
[TD]536...[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]11[/TD]
[TD]f5 Sapp[/TD]
[TD][/TD]
[TD]53A...[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]drops[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]f5 Sapp[/TD]
[TD][/TD]
[TD]53A...[/TD]
[TD][/TD]
[TD][/TD]
[TD]rare drops[/TD]
[TD]drops[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]13[/TD]
[TD]f5 silver[/TD]
[TD][/TD]
[TD]537...[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]14[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536...[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]15[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536020420[/TD]
[TD]3.44[/TD]
[TD]none[/TD]
[TD][/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]16[/TD]
[TD]f5 silver[/TD]
[TD][/TD]
[TD]537...[/TD]
[TD][/TD]
[TD][/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]17[/TD]
[TD]f5 Sapp[/TD]
[TD][/TD]
[TD]53A...[/TD]
[TD]3.30[/TD]
[TD][/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]18[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53A0026[/TD]
[TD]3.44[/TD]
[TD][/TD]
[TD]N/A[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]iPhone7[/TD]
[/TR]
[TR]
[TD]19[/TD]
[TD]f5 Sapp[/TD]
[TD]APAC[/TD]
[TD]53A0...[/TD]
[TD]2.9[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]iPhone7+[/TD]
[/TR]
[TR]
[TD]20[/TD]
[TD]f5 Sapp[/TD]
[TD][/TD]
[TD]53A022..[/TD]
[TD]4.10[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]Xiaomi Redmi 4 Prime[/TD]
[/TR]
[TR]
[TD]21[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536...[/TD]
[TD]3.30[/TD]
[TD][/TD]
[TD]N/A[/TD]
[TD]drops[/TD]
[TD][/TD]
[TD]S7[/TD]
[/TR]
[TR]
[TD]22[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536004113[/TD]
[TD]3.30[/TD]
[TD]bad at times[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD][/TD]
[TD]Galaxy Note 4[/TD]
[/TR]
[TR]
[TD]23[/TD]
[TD]f5 slate[/TD]
[TD]EU[/TD]
[TD]536007...[/TD]
[TD]3.44[/TD]
[TD]yes[/TD]
[TD]yes, esp tempe issues[/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]24[/TD]
[TD]f5 slate[/TD]
[TD]USA[/TD]
[TD]536013689[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops (5m)[/TD]
[TD]N/A[/TD]
[TD]iPhone7[/TD]
[/TR]
[TR]
[TD]25[/TD]
[TD]f5s Sapp[/TD]
[TD]APAC[/TD]
[TD]56900...[/TD]
[TD]2.9[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD][/TD]
[TD]S8[/TD]
[/TR]
[TR]
[TD]26[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536006...[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]some drops[/TD]
[TD]N/A[/TD]
[TD]S6[/TD]
[/TR]
[TR]
[TD]27[/TD]
[TD]f5 Sapp[/TD]
[TD][/TD]
[TD]53A022...[/TD]
[TD]3.42[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]28[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536...[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]29[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53A022...[/TD]
[TD]3.42[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]30[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536...[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]31[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]536007042[/TD]
[TD]3.44[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none (5m)[/TD]
[TD]N/A[/TD]
[TD]iPhone7[/TD]
[/TR]
[TR]
[TD]32[/TD]
[TD]f5 Sapp[/TD]
[TD]APAC[/TD]
[TD]54M3...[/TD]
[TD]2.90[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]iPhone6+[/TD]
[/TR]
[TR]
[TD]33[/TD]
[TD]f5S[/TD]
[TD]EU[/TD]
[TD]56800029.[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]N/A[/TD]
[TD]iPhone7[/TD]
[/TR]
[TR]
[TD]34[/TD]
[TD]f5 Sapp[/TD]
[TD]UK[/TD]
[TD]53A042410[/TD]
[TD]3.44[/TD]
[TD]none[/TD]
[TD]drops (tempe, footpod)[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]35[/TD]
[TD]f5 slate[/TD]
[TD]EU[/TD]
[TD]5360052..[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]drops (3m)[/TD]
[TD]N/A[/TD]
[TD]Nexus 6p[/TD]
[/TR]
[TR]
[TD]36[/TD]
[TD]f5 Sapp[/TD]
[TD]USA[/TD]
[TD]53B001248[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]37[/TD]
[TD]f5 silver[/TD]
[TD]USA[/TD]
[TD]537006151[/TD]
[TD]3.44[/TD]
[TD]None[/TD]
[TD]None[/TD]
[TD]drops (?)[/TD]
[TD]N/A[/TD]
[TD]PIXEL XL 7.1.2[/TD]
[/TR]
[TR]
[TD]38[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53C0014..[/TD]
[TD]3.44[/TD]
[TD]intermittent[/TD]
[TD]N/A[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]OnePlus 3[/TD]
[/TR]
[TR]
[TD]39[/TD]
[TD]f5S[/TD]
[TD]USA[/TD]
[TD]568001..[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]drops (footpod)[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]iPhone6S[/TD]
[/TR]
[TR]
[TD]40[/TD]
[TD]f5 Sapp[/TD]
[TD]USA[/TD]
[TD]539000..[/TD]
[TD]3.30[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]iPhone6[/TD]
[/TR]
[TR]
[TD]41[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53A0014..[/TD]
[TD]4.10[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD][/TD]
[TD]Moto X Force 6.0[/TD]
[/TR]
[TR]
[TD]42[/TD]
[TD]f5 slate[/TD]
[TD]EU[/TD]
[TD]5360479..[/TD]
[TD]4.10[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]5m drops[/TD]
[TD]N/A[/TD]
[TD]Xperia Z1 Compact[/TD]
[/TR]
[TR]
[TD]43[/TD]
[TD]f5 Sapp[/TD]
[TD]EU[/TD]
[TD]53A0153..[/TD]
[TD]4.10[/TD]
[TD]none[/TD]
[TD]drops[/TD]
[TD]none[/TD]
[TD]slow[/TD]
[TD]iPhone 5S[/TD]
[/TR]
[TR]
[TD]44[/TD]
[TD]f5 slate[/TD]
[TD][/TD]
[TD]5360197...[/TD]
[TD]4.10[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]none[/TD]
[TD]N/A[/TD]
[TD]iPhone 7+[/TD]
[/TR]
[/TABLE]
I'll update the table as info is added below. If your device is listed and you want to add info, refer to the # column.
This is only going to be as useful as the inputs received, so let's see how it goes...
