The file "FRITZ.Box_5690-recover.exe" in this directory contains a recovery 
 program for the stated FRITZ!Box. The program is for the exclusive purpose of 
 recovering the type of FRITZ!Box product variation indicated in the file name. 
 It may under no circumstances be run with a FRITZ!Box of another type. 
		 
 Recover is not necessary for normal operation and should only be used when 
 explicitly recommended by AVM Support!

Please find instructions for recovering your device here:

https://avm.de/service/wissensdatenbank/dok/FRITZ-Box-5690/160_FRITZ-OS-der-FRITZ-Box-wiederherstellen