If a phone is imported from a region that doesn't support your native language, flashing a firmware version tailored for your country will install the necessary keyboard layouts and system languages.
For most users, downloading a known-good stock ROM is easier than backing up themselves. Nokia Ta-1399 Firmware
The is the model number for the Nokia X100 , a 5G smartphone launched specifically for the US market (primarily on T-Mobile and Metro by T-Mobile). Reviews of its firmware and related services generally focus on repairability, bootloader unlocking, and performance stability. Firmware Overview & Common Issues If a phone is imported from a region
: Some users report a stable experience with the built-in firmware, while others have noted occasional freezes or touch screen responsiveness issues over long-term use. Nokia Ta-1399 Firmware