[Windows 10 Mobile] centaurian:
OK. I was able dissasembly fieldtest app and I found out, that it needs ftdservice.dl. It seems like Lumia 640 LTE Dual sim after upgrading to Windows 10 doesn't have ftdservice.dll in C:\Windows\System32\. I was able to decompile 950 ffu image and add missing service dll and its's dependecies into System32. I also imported some missing registry keys from 950

I have problem with this key:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SecurityManager\ServiceAccounts]

"ServiceAccountCapabilityGroupMemberShips"

Since it exists on both registry files, but it has different format on my 640:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SecurityManager\ServiceAccounts]
"ServiceAccountCapabilityGroupMemberShips"=hex:02,00,00,00,0c,02,00,00,2c,00,\
00,00,0b,00,00,00,58,00,00,00,00,00,00,00,1c,02,00,00,58,00,00,00,00,00,00,\
00,58,00,00,00,04,00,00,00,68,00,00,00,84,00,00,00,a0,00,00,00,bc,00,00,00,\
d8,00,00,00,f4,00,00,00,10,01,00,00,2c,01,00,00,48,01,00,00,64,01,00,00,80,\
01,00,00,9c,01,00,00,b8,01,00,00,d4,01,00,00,f0,01,00,00,01,05,00,00,00,00,\
00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,d2,05,00,00,01,05,00,\
00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,d3,05,00,00,\
01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,3b,\
05,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,\
77,1a,7e,06,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,\
2f,4b,7f,77,1a,0f,04,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,\
53,9e,65,2f,4b,7f,77,1a,95,04,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,\
a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,83,04,00,00,01,05,00,00,00,00,00,05,15,00,\
00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,07,04,00,00,01,05,00,00,00,00,00,\
05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,09,04,00,00,01,05,00,00,\
00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,a7,05,00,00,01,\
05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,1a,0b,04,\
00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,4b,7f,77,\
1a,d2,05,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,9e,65,2f,\
4b,7f,77,1a,d3,05,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,1a,a1,53,\
9e,65,2f,4b,7f,77,1a,7e,06,00,00,01,05,00,00,00,00,00,05,15,00,00,00,d1,a7,\
1a,a1,53,9e,65,2f,4b,7f,77,1a,0f,04,00,00,57,00,50,00,41,00,55,00,44,00,49,\
00,4f,00,00,00,57,00,50,00,4e,00,45,00,54,00,57,00,4f,00,52,00,4b,00,44,00,\
52,00,4d,00,00,00

Native Windows 10 phones (550/650/950) has this this registry key:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SecurityManager\ServiceAccounts]
"ServiceAccountCapabilityGroupMemberShips"=hex:64,62,02,00,F0,8F,50,00,00,00,00,00,F0,FF,FF,FF,20,D0,50,00,20,10,51,00,00,00,00,00,68,62,69,6E,00,90,50,00,00,10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,64,00,42,00,00,00,A0,90,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,30,35,37,35,32,39,37,32,35,2D,32,38,34,35,33,34,36,33,37,35,2D,33,35,32,35,39,37,33,39,32,39,2D,32,33,30,32,36,34,39,39,34,35,2D,33,30,37,33,34,37,35,38,37,36,2D,33,34,37,32,34,31,35,31,32,2D,34,31,36,37,39,39,36,32,31,38,2D,33,39,31,35,32,31,34,38,38,36,00,00,00,00,B8,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,52,00,45,00,53,00,54,00,52,00,49,00,43,00,54,00,45,00,44,00,5F,00,55,00,41,00,50,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,64,00,42,00,00,00,68,91,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,30,39,30,34,31,37,35,39,36,2D,31,31,37,37,31,35,32,34,33,33,2D,37,30,39,39,37,37,31,35,39,2D,33,37,35,39,38,36,36,33,33,39,2D,33,36,34,38,31,31,36,39,32,35,2D,31,31,39,34,39,37,37,33,33,32,2D,33,34,35,39,31,36,39,37,30,31,2D,31,36,35,32,35,37,33,32,35,34,00,00,00,00,B8,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,52,00,45,00,53,00,54,00,52,00,49,00,43,00,54,00,45,00,44,00,5F,00,55,00,41,00,50,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,61,00,3C,00,00,00,10,8F,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,31,34,39,36,34,31,33,34,36,2D,32,30,32,33,33,38,31,39,36,35,2D,31,32,36,38,31,32,32,38,30,35,2D,32,30,38,36,39,37,34,30,33,2D,31,30,35,30,34,38,30,38,33,2D,34,32,37,38,30,30,31,33,37,34,2D,31,39,31,32,37,34,35,33,31,37,2D,35,34,34,33,31,38,30,37,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,61,00,42,00,00,00,B0,92,50,00,07,00,00,00,01,00,00,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,31,36,36,31,37,36,32,30,2D,37,36,37,38,38,36,34,31,37,2D,32,30,33,31,34,30,33,33,31,36,2D,34,31,33,37,36,34,38,30,36,32,2D,33,38,36,35,38,38,30,33,34,2D,32,32,38,32,32,31,38,34,35,32,2D,37,34,35,35,35,39,35,37,38,2D,32,33,38,37,32,32,38,35,38,37,00,00,00,00,00,00,00,B8,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,52,00,45,00,53,00,54,00,52,00,49,00,43,00,54,00,45,00,44,00,5F,00,55,00,41,00,50,00,00,00,00,00,00,00,88,FF,FF,FF,76,6B,60,00,3C,00,00,00,50,8F,50,00,07,00,00,00,01,00,00,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,31,36,37,34,35,33,36,35,30,2D,36,32,34,37,32,32,33,38,34,2D,38,38,39,32,30,35,32,37,38,2D,33,32,31,34,38,34,39,38,33,2D,37,31,34,35,35,34,36,39,37,2D,33,35,39,32,39,33,33,31,30,32,2D,38,30,37,36,36,30,36,39,35,2D,31,36,33,32,37,31,37,34,32,31,80,FF,FF,FF,76,6B,63,00,42,00,00,00,F0,93,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,32,31,33,33,38,35,30,35,37,2D,31,30,30,32,39,34,33,30,39,38,2D,31,37,32,33,30,35,31,39,32,37,2D,31,34,31,39,31,35,32,34,30,36,2D,33,38,37,30,31,32,36,34,34,32,2D,38,34,38,38,39,34,36,35,39,2D,35,35,39,36,36,34,36,35,36,2D,32,33,36,34,36,37,37,31,33,35,00,00,00,00,00,B8,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,52,00,45,00,53,00,54,00,52,00,49,00,43,00,54,00,45,00,44,00,5F,00,55,00,41,00,50,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,63,00,42,00,00,00,B8,94,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,32,32,30,35,34,30,32,33,37,2D,32,36,38,39,31,36,35,36,32,34,2D,34,30,36,33,30,32,32,36,32,31,2D,34,38,35,34,32,33,34,31,33,2D,33,34,34,36,35,37,33,35,30,35,2D,35,33,30,30,32,37,30,32,36,2D,33,32,36,33,33,39,31,32,33,30,2D,33,35,31,32,38,30,35,32,32,33,00,00,00,00,00,B8,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,52,00,45,00,53,00,54,00,52,00,49,00,43,00,54,00,45,00,44,00,5F,00,55,00,41,00,50,00,00,00,00,00,00,00,80,FF,FF,FF,76,6B,63,00,3C,00,00,00,90,8F,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,32,35,31,30,34,39,38,31,37,2D,32,30,30,39,34,35,36,35,30,30,2D,31,35,35,31,31,39,37,34,39,31,2D,32,31,33,34,35,35,38,32,31,38,2D,33,35,34,35,33,35,31,39,34,32,2D,38,31,37,33,36,32,38,37,36,2D,33,34,39,34,36,35,30,32,30,32,2D,35,39,39,32,34,37,34,31,32,00,00,00,00,00,80,FF,FF,FF,76,6B,63,00,3C,00,00,00,00,96,50,00,07,00,00,00,01,00,54,00,53,2D,31,2D,31,35,2D,33,2D,31,30,32,34,2D,33,32,39,39,32,35,35,32,37,30,2D,31,38,34,37,36,30,35,35,38,35,2D,32,32,30,31,38,30,38,39,32,34,2D,37,31,30,34,30,36,37,30,39,2D,33,36,31,33,30,39,35,32,39,31,2D,38,37,33,32,38,36,31,38,33,2D,33,31,30,31,30,39,30,38,33,33,2D,32,36,35,35,39,31,31,38,33,36,00,00,00,00,00,C0,FF,FF,FF,43,00,41,00,50,00,41,00,42,00,49,00,4C,00,49,00,54,00,59,00,5F,00,43,00,4C,00,41,00,53,00,53,00,5F,00,57,00,49,00,4E,00,44,00,4F,00,57,00,53,00,5F,00,55,00,41,00,50,00,00,00,00,00,80,FF,FF,FF,76,6B,63,00,42,00,00,00,C0,96,50,00,07,00,00,00,01,00,00,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shortened due post length

Obviously It seems it's needed. SC command sees service as this:

Microsoft Windows [Version 10.0.14393]
Copyright (c) Microsoft Corporation. All rights reserved.

C:\windows\system32>sc start ftdservice
[SC] StartService FAILED 1069:

The service did not start due to a logon failure.

Is here someone who has non-native Windows 10 phone upgraded to Windows 10 and has FieldTest working?