Not been on the modding scene for a few years!
Ive bought an S7 as my S6 decided to take a swim!

i bought it online, ( i regret already)
Its a device from the Netherlands on the EE network.
i would like to change to the Uk's BTU software and then possibly to EE's (EVR) if wifi calling is not available in BTU.

Is there a complete guide for changing the CSC and firmware ? Ive got a Stock UN-rooted S7 on Baseband G930FXXU1APBD

any help will be much appreciated.