Apple on Monday posted a new support document, acknowledging the existence of a recently-exposed date settings bug in iOS that can render a device unusable.

"Manually changing the date to May 1970 or earlier can prevent your iOS device from turning on after a restart," the document states. When the bug was originally made public, it was believed that users had to rewind iOS' date all the way back to Jan. 1, 1970.

The company is promising to fix the issue in an "upcoming software update," but without offering any other specifics. Apple also isn't offering any temporary solutions for salvaging a device.

Any 64-bit hardware running iOS 8 or 9 is believed to be susceptible to the glitch, which will most frequently leave it stuck at the Apple logo, unable to finish booting. Even the full complement of restore options won't work.

Anecdotes have hinted that some devices may spontaneously recover on their own several hours later, but with extremely slow performance if so.