Microsoft has fixed the glitches with Windows 8.1 RT that caused problems for some users' Surface tablets last week following the release of the update.
Microsoft pulled the Windows 8.1 RT update from the Windows store two days after launch, after "a very small number" of Surface RT users had their devices were "bricked" after downloading the update.
Others experienced the dreaded "blue screen of death."
Microsoft said only about one out of every 1000 Surface RT 8.1 installations rendered users' tablets unbootable.
"This was due to a rare situation where firmware updates had not completed at the time of the update to RT 8.1. In most cases, if a customer encountered this issue the result was simply an extra reboot," the Microsoft spokesperson said.
Microsoft, after pulling the Windows 8.1 RT update, moved quickly to give users a downloadable recovery image that could be loaded onto bricked Surface RT tablets from a USB drive.
Windows 8.1 RT hasn't been popular with users, even with the longer battery life afforded by its use of ARM processors. Microsoft took a US$900 million charge in July on unsold Surface RT inventory, and it has begun giving the tablets away for free to schools that agree to use its Bing search engine.