The Sagemcom 4315 looks for a TFTP server on 192.168.100.10 upon boot failure. Set up a TFTP server on your PC, place the stock .bin file there, and power cycle the modem. It will auto-pull the "Extra Quality" stock build.
Sagemcom Fast 4315 Firmware Extra Quality: How to Maximize Your Router’s Performance sagemcom fast 4315 firmware extra quality
Log in using your admin credentials. If you haven't changed them, check the sticker on the router for the default username and password (commonly admin / admin or admin / password ). 4. Flash the New Firmware The Sagemcom 4315 looks for a TFTP server on 192
The Sagemcom F@st 4315 relies on specific configurations and security certificates embedded in the ISP's official firmware to authenticate with the network. Custom firmware can permanently break this connection, leaving you without internet access. Custom Firmware Compatibility (OpenWrt / DD-WRT) Sagemcom Fast 4315 Firmware Extra Quality: How to
Most "Extra Quality" updates are trialed by ISPs before wide release.
If the router reboots randomly (a known bug with heavy torrenting or Apple devices connecting), it is often due to in the firmware heap.