Lumia 521 Unlockin Bootloader

[nitikosovo]

where can i find engineering slb3 files for lumia 521 or can i use lumia 520 file for this!

 

[charlatan1978]

Hi, you are probably better off asking this question on the xda-developers forums.
The post below is discussing your question (I haven't read through it all).

https://forum.xda-developers.com/wi...indows-phone-internals-unlock-t3257483/page44