Microsoft over the weekend released a firmware update for Surface Pro 2 users that were affected by a botched update last month. The update is described by sources close to the company as one of multiple pending updates or a partial update as reported by ZDNet's Mary Jo Foley. If at first you don't succeed, try, try again.

It all started in early November when Microsoft released a firmware update for the slate shortly after it was released. The update allowed the Marvell Wi-Fi chip to enter a low power state that improved battery life by up to 25 percent in certain circumstances.

A month later, Microsoft issued yet another firmware update but this time, things didn't go over as smoothly.

The second update actually made battery life much worse than before for those that were able to install it at all. What's more, some users found that the tablet was no longer able to fully charge or that it wasn't showing it was being charged while others experienced a variety of wake and sleep issues. Redmond pulled the update shortly after.

The new update has yet to appear on the company's official update history page. Of course, since it is designed specifically for those that were affected by the December update, it might not show up on the ledger at all.

As we understand it, the update is rolling out in waves over the coming days. Let us know in the comments below if you were affected by the original update and if you have received the new update yet.