Howto update the raspberry pi like a charm (on Linux,Mac,Windows)!
After all, you need check this website and check the night build.
Download the last build and decompress them
After decompress, you will see this files
And mount the raspberry pi file share
Go to Nautilus -> Go -> (and type) smb://IP.ADDRESS/Update
Go to Finder -> cmd + k -> (and type smb://IP.ADDRESS/Update
Go to (win key + r ) and type \\IP.ADDRESS\Update
And copy only this file (see below) to share
Once the files have copied, reboot the raspberry pi and it should update to the latest release.