This was an update you tried to flash from the 'System Updates' area? The Mfg date on my K1 is a full 3 months earlier than yours, and I haven't experienced your issue yet. Have you tried resetting the tablet? Cant remember exactly where, but there's a post floating around talking about key-presses not for recovery but for resetting the K1. Don't know if that'd help.
Also, what was your build number out-of-box before any updates, found in "About Tablet"?
ViewSonic G-Tab (G-Harmony ICS 4.0.4 ODEXed; OCed@1.5ghz)
Lenovo IdeaPad K1 (4.1.1 CM10 JB v5 OCed@1.4ghz by krook1)
Razr MAXX XT912 (Waiting for JB to get stable, currently: Biotic Nx 1.2; OCed @ 1.325ghz)
"I know enough to know that I don't know much"