The first boot after installing an takes 10–15 minutes. Do not force reboot.
If this is your primary phone and you rely on VoLTE calling or professional-grade photography—. The camera and call quality trade-offs are steep. n920c custom rom
A: No. Once you flash TWRP, the Knox e-fuse is blown (0x1). Samsung Pay, Secure Folder, and Health will never work again. The first boot after installing an takes 10–15 minutes