I wrote this yesterday under another topic, but I want to repeat it here so that the topic makes the problem clear. Yesterday, with my first or second boot after installing build 7820, with secure boot enabled, I couldn't boot up, but got a blue screen stop error. Fortunately I had an external back up image that I was able to restore. But my suspicion is that the problem was an incompatibility between Rollback Rx. and secure boot (even though Rollback installed without any hitches). I've since disabled secure boot and gone back to the previous version of 10.5 (just to be safe). But build 7820 has certainly not solved the secure boot problem, at least not for a Lenovo IdeaCenter 300 desktop. Or maybe it's even worse than that. Maybe the new feature of booting from the PE environment -- whatever that is -- causes problems on some systems whether secure boot is enabled or not. But I don't feel like experimenting to find out, at least not yet.
No announcement yet.
build 7820 does not fix secure boot issues -- blue screen failure