FRITZ!Box - reboot loop every 30s after restore tool, Power/WLAN LEDs blink

Hello

I thought I'd post on this forum to seek some advice.

A Fritz!Box is in a constant loop: it looks like it restarts itself every 30 s. You can access the login page and it's possible to reset the password, but nothing beyond that.

I've used the restore tool to successfully restore the bootloader, but it looks like this hasn't resolved the issue.

Any ideas?

The sequence of LEDs is as follows:
- Power LED - it lights up
- After a few seconds, WLAN LED lights up and both Power and WLAN blink simultaneously
- WLAN then becomes solid
- All LEDs light up and the process repeats itself

AI: What exact FRITZ!Box model is it, and which recovery/restore tool or firmware version did you use?
5690 Pro
Fritz restore tool
AI: Are you using the original power supply, and have you tried booting it with everything disconnected except power and one LAN cable to a PC?
Yes.

First, replace the power supply. It should have the same voltage and slightly more power.

@wg20032003
The FRITZ!Box stores the active boot partition in a variable called linux_fs_start (with a value of either 0 or 1). Sometimes, the recovery tool flashes the working system onto one partition, but the router keeps trying to boot from the corrupted one.

As you can access the bootloader, you can manually switch the active partition using an FTP client:
- Set a static IP address on your PC: IP: 192.168.178.2, Subnet Mask: 255.255.255.0, Gateway: 192.168.178.1.
- Unplug the router’s power cable.
- Open Command Prompt (CMD) on your PC, type

ftp 192.168.178.1

, but do not press Enter yet.
- Plug the power cable back in and immediately (within the first 2–3 seconds) press Enter in CMD.
- When prompted for credentials, use ‘adam2’ for both the username and password.
- Check the current active partition by typing: quote GETENV linux_fs_start
- If the output is 0, change it to 1 (or vice versa) by typing: quote SETENV linux_fs_start 1 (or 0 if it was 1).
- Type ‘bye’ to exit, then unplug the router from the mains socket for 10 seconds.

Ensure that the “Fritz Restore” tool you used is the official recovery file provided directly by AVM for this specific model.
- Download the official recovery file (FRITZ.Box_5690_Pro-0x.xx-recover.exe) from the official AVM FTP server
- Important: Disable your antivirus software and Windows Firewall completely before running it. These programmes frequently block the UDP broadcasts required to flash the image.
Click:
ftp.avm.de/fritzbox/fritzbox-5690-pro/other/recover/