close best dongle exe. Download and run this file . press update all . close this file and run best dongle exe . now you will see unlock button 
http://www.infinity-best.com/download/public/Configurator.rar

 

Solution to unlock phones which give error 0060 ( mostly from UK networks ) 
1) full flash the phone using the firmware
FFU : RM974_02040.00021.15235.30008_RETAIL_prod_signed_1080_02D51C_000-GB.ffu

2) you must have the following tick marked before start flashing
a) Change PC and NVI

3) after flashing Unlock the phone

4) TIP : if you can not find the same firmware. download any firmware which DOES NOT have the following

Product code
1 059W8Q7
2 059W8V0 
3 059W8V6
4 059W913
to unlock latest WP10 phones like Lumia 550. 650 and more use Best software Latest  version from support area http://server1.infinity-best.com/download/pub.php?dir=software/

 

 

UNLOCK FOR LUMIA INSTRUCTION

STEP 1 
to unlock latest WP10 phones like Lumia 550. 650 and more use Best software version 2.21 or higher from support area http://server1.infinity-best.com/download/pub.php?dir=software/

STEP2
close best dongle exe. Download and run this file . press update all . close this file and run best dongle exe . now you will see unlock button 
http://www.infinity-best.com/download/public/Configurator.rar

Step 3

 

close best dongle exe . go to best dongle folder. open settings.ini file and enter there the user name and password you recieved. save the file . open best.exe and now you are ready to unlock your phone

 

Note: Please 1st check through Navimanager if ENO file is available for your model then apply if ENO file is not available and you try to unlock the credits will gone and Unlock will not be done