The ‘global’ version sm-g998b allows bootloader unlocking unlike the versions intended for use in the US/Canada.

However, if unofficial content is detected with an unlocked bootloader, the Knox warranty bit trips, and Samsung Pay, Secure Folder, Samsung Health, Samsung Pass, MDM, and warranty are revoked even after returning to the fully official software.

For the best experience with cellular and warranty, the phone should ideally be one that’s intended for use in your location.

s918u1 users on T-Mobile/Metro, RINAWireless, Copper Valley have it, a lot of others don’t, at the moment.

The screen calibration is not static. The old terminology was mDNIe mode and scenario. The mode is selectable in the settings. The scenario is chosen automatically!

It is forbidden to downgrade from

G889AUCS9DVC1
.…↑ 9

to

G889AUCU3ATD4
.…↑ 3

It fails with an error message similar to sw rev check fail fused 9 binary 3, i.e. it’s a downgrade to 3 but the minimum allowed version is 9.