Why am I unable to turn off flight mode on my Lumia 520?

[Windows Central Question]

why its unable to turn off flight mode in limia 520?

Cant get flight mode off in nokia limia 520 after cyan update.Please help with solution.

 

[ven07]

This is a known issue... Here are some links to read through:

Mobile Community - Nokia Lumia 520( cyan) : Airplane mode stuck and r... - Microsoft Mobile Community

Cant get flight mode turn off Nokia lumia 520 - Microsoft Community

http://forums.windowscentral.com/nokia-lumia-520/303734-[l520]-unable-turn-off-flight-mode.html

Best answers.. Get a new SIM or use nokia recovery tool which is now lumia recovery tool

However those don't always work..