How to make my device developer unlocked???

[nitikosovo]

Hello I want to know how to make my Lumia developer unlocked??
Please show me the ways and the XAP limit and tell me which one you recommend!!!??
My Lumia 521 is running WP 8.1 Denim

 

[abhishek singh21]

Here is the complete guide on how to How to unlock your Windows Phone for app development | Windows Central