Yesterday my laptop got stuck in a rollback loop after a failed update. No recovery option was working. I got out of the loop by selecting Windows 10 as my choice of OS for the boot. However, after that, I was stuck in the corrupt OS (no desktop, no function
at all), with no way to access the recovery unit on my hard disk. I didn'n even manage to open the boot menu at startup. I have solved the problem after resetting the CMOS memory; to do this, follow these steps: 1) remove power supply and battery, 2) hold
power button down for about a minute, 3) mount battery and start pc as usual. After that, Windows rollback started working properly at reboot, and all the recovery options were correctly available again. I have recovered the original Win10 installation without
losing any data (but I lost apps). I think resetting CMOS memory will work also for directly getting out of the loop.