Code:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost\Applicability]
"EnablePreviewBuilds"=dword:00000002
"RingId"=dword:0000000a
"RingBackup"="WIS"
"Ring"="WIF"
"AdminFlowsValidateFlightSettingsHr"=dword:00000000
"FlightingOwnerSID"="S-1-5-21-3574322566-3635618791-2004247165-1001"
"IsRetailOS"=dword:00000001
"IsConfigExpFlightingEnabled"=dword:00000001
"IsConfigSettingsFlightingEnabled"=dword:00000001
"IsBuildFlightingEnabled"=dword:00000001
"UseSettingsExperience"=dword:00000000
"ContentType"="Branch"
"WNSUriRegName"=hex:55,f8,0c,a4,f3,6f,3d,97,51,e9,a4,14,da,66,a5,5d,c6,b7,10,\
c5,bf,5a,7b,d2,63,85,f2,f9,77,88,e4,53,f5,19,80,5e,a9,87,f9,03,d6,86,a9,dd,\
b7,3b,43,1d,43,2c,df,26,a3,fc,d6,28,f2,ed,43,c5,cf,76,0b,90,4a,cc,3e,6e,14,\
ef,4c,94,24,3c,26,c2,82,35,ec,4e,7f,2b,ae,45,df,77,22,5e,ab,36,5e,13,ef,1f,\
57,e3,05,eb,cd,55,62,05,37,ef,b3,5c,0c,5b,92,ed,59,e8,c4,22,11,e6,02,7b,bd,\
6e,9e,91,0f,6a,ed,96,33,56,7e,17,80,cb,a9,59,6e,79,9c,1a,b0,1d,34,97,e7,27,\
04,4a,89,15,7c,42,9c,a1,bb,a0,44,a7,fa,9f,90,f7,92,e2,97,f8,15,c5,78,00,9e,\
cf,8f,8b,eb,38,b1,1d,0b,cf,d9,35,9b,11,71,be,af,33,a4,cc,6c,7d,5e,21,6c,b5,\
05,7b,95,4d,69,f0,a5,cc,05,29,75,b6,6b,0e,30,7f,83,ff,90,35,91,6f,3c,17,ad,\
e9,44,8f,7b,a7,52,b3,32,0d,51,42,87,69,ab,23,9e,8a,d2,53,53,a8,93,89,16,85,\
b3,c0,b5,4f,8b,fb,bf,43,48,4e,82,e2,40,a4,73,78,03,a9,e5,96,d6,72,7a,37,be,\
64,4c,78,c9,3f,a8,b4,08,87,4b,9e,38,b9,81,d0,cd,04,e0,86,e5,4b,e4,30,7b,06,\
b4,2d,76,b8,6a,ef,82,78,29,20,1d,2b,1a,1e,fb,f8,3b,f6,05,8a,17,fe,0b,87,f3,\
a5,49,ab,3d,63,f5,74,67,a0,97,a3,32,a9,5d,9d,45,a0,71,67,f6,92,00,51,1b,8a,\
a5,23,1d,eb,b0,fa,31,4b,31,35,dd,88,cb,90,af,da,3f,07,67,91,c6,30
Most of the DWORD values were 0, now changed to 1, and ring backup was set at "WIF" too, so I set it as WIS, and the update started after a reboot.