Hi I have Lumia 640, It took almost 1hr 30 min to upgrade to build 10572 from 8.1 after upgrate its took almost 5-7 min to restart my phone.
Soon after restart data migration started & one its completed it restarted again.
After restart is requesting PIN to enter, However it does not recognize my PIN, After so many failed attempt i forced to re-start my phone.
Now My phone is locked up !!! Message on screen " You've entered an incorrect PIN too many times. To try again, resart your device.
I have shutdown & restarted my phone 3-4 times, each time it takes 5-7 min to startup.
Nothing happning .. Please help !!!