Example of free FTP server:
ftp.gnu.org
ftp.pureftpd.org
ftp.vim.org
ftp.slackware.com
The primary reason advanced users seek the is for NR-CA (New Radio Carrier Aggregation) .
often feature "locked-down" firmware. These versions may restrict band locking or hidden diagnostic menus to ensure the device stays optimized for that specific carrier's network. Global/Generic (Stock) Firmware