Sometimes. You can use combo to access hidden network menus ( *#0011# ) and change CSC. But full SIM unlock often still requires a code or server-based service.
No. You must already be on bootloader U6. You cannot upgrade bootloader via combo file. Use stock firmware to upgrade bit first. g970u u6 combination
with . Combination files are proprietary, internal Samsung firmware used for factory testing, hardware diagnostics, and bypass procedures. What is Combination Firmware? Sometimes