Lumia 640 W10M Build 10586.11 Experience for those interested:
I had done a hard reset on Build 10581, so after updating to 10586.11 the boot loop did occur. A simple hard reset key-combination fixed this and it got through relatively fast.
While going through setup my Wi-Fi was being considerably slow and spotty which caused the Microsoft sign-in to produce errors. Eventually it did go through, but only let me select the fresh start option. After getting in, I had about 46 app updates which included the built in ATT apps which I removed. Everything was smooth and snappy and felt solid.
Suddenly, I ran into a game-changing problem. I assume this was due to the aforementioned Microsoft sign-in error problems, but what had happened was that my Text messages couldn't sync up due to a bug that prevented me from being able to sign-in to my Microsoft account. After trying everything to get it to work, I just decided to do another hard rest on a solid internet connection.
After doing this, everything worked fine and my texts synced up fully in a matter of an hour.
Battery Life
The battery life on this build is questionable. In about 4-5 hours of med/high usage on apps like Messenger,Messaging, Converge, Photos, etc. my battery went from 100% - 60%. I have yet to fully put the battery life to the test.
Store and App Updates
Store updates things really quickly, as well as opening much faster. However, there are 7 apps that refuse to update. These apps are:
- Lumia Selfie
- Extras & info
- Network services
- Transfer My Data
- Lumia Storyteller
- Rate Your Device
- motion data
These are most likely server-sided and I expect them to fully download in the next week as MSFT fixes things on their end.
Boot Times
Shutdown Time after "Don't Forget" message dissapears: 9s
Boot Up Time: 29s (Also, Microsoft logo always seems to come up twice before going on to Windows Logo)
Another thing to note with this build on my L640 is that you cannot hide the Nav-bar on non-W10 apps. Legacy apps from 8.1 appear to keep make the nav-bar stuck on screen.
If anyone has anymore questions please feel free to reply with some!