Its a warning and news for all the Lumia 520/525/526 users, that the Windows 10 Technical Preview Update is pulled off by the Microsoft for the safety of these devices. So if you will try to update to Windows 10, you wont be able to.
Reason being on Lumia 520/525/526 devices when trying to roll back to Windows Phone 8.1 using the Windows Phone Recovery Tool, these smartphones were getting bricked. And apparently many people are facing this problem. Microsoft said that
“We are pausing build availability for these devices temporarily while we investigate the issue and work with customers who have reported problems.”
So we should be able to see some solution to this problem soon enough.
For more info stay tuned.