You mean KB4073290?
KB4073290 is for x64/64bit and KB4073291 is for X86/32bit, and boot updates solved the same issue with AMD Athlon 64 and related CPUs with unbootable status caused by KB4056892.
Melerix, thanks for your help through this shambles. I have a 2008 Toshiba Satelite with a Turion 64 X2. I ran into trouble installing KB4073290 so I hope what I've outlined below may help if anyone else has similar trouble.
I downloaded the update as a standalone and installed it. It took forever. When "complete" I restarted as asked and then found I was back to Jan4th and what happened with KB4056892:
restart ended with the computer switching itself off before BIOS loaded. And again. And again. So I disconnected power and battery and again restarted. Windows started to load, declared itself broken and went into repair mode, eventually saying it couldn't
self repair. Having had to reset on Jan4th, I went for the "continue to Windows 10" option. Shut down by itself again. I thought all was lost at this stage but again removed all power sources and tried restart. Used F12 this time and after going through boot
screens this time Windows started to load again, then a blue screen telling me the update was only at 89%! Left it to continue and it went through to 100%, restarted and I now have a computer running build 16299.194, as it should be.
Hope it doesn't happen to anyone else but, if so, nil desperandum.