Try to run OpenWRT/LEDE on AVM Fritz!Box Fon WLAN 7170.
LEDE Beginners Build Guide
LEDE Quick Image Building Guide
OpenWRT Wiki (mostly outdated)
Working precompiled images for OpenWRT 8
FritzBox Partitioning Layout (german)
Fritz-Flash Perl Script
Old Howto Compile Firmware Fritz!Box 7170
ar7 Fritz Patches for OpenWRT
more ar7 Fritz Patches for OpenWRT