Question about FRITZ! Box 7590 (A/CH version)

so it works perfectly with the 7490. I did this with my 7490 a year ago without any problems. Originally you just have to have an older firmware on the 7490 and then in the ruKernel tool "Upload" --> "Hold in Adam2". Then "quote SETENV firmware_version avm". Then "quote REBOOT".
After this, the box will no longer boot correctly and a German recovery image must be installed via recovery.
Then the box is immediately a German version

Unfortunately, I have not yet found a way to do this analogously with the 7590. :-(

the adam2 variant works with the 7490/CH to update to 7.11. simply send the ftp commands after the incompatibility message (ip specified) and then continue without rebooting and do not start again (do not disconnect from the power supply).

Hi guys, the Fritz!Box OS 7.00 is now available for download on the AVM homepage, install: All IP , Sip Credential request at Swisscom the Tel. with the SIP enter the Bnutzernamen and password) log on then the box should work without errors. I had the last version beta on my box and at noon the OS 7.00 installed itself automatically with the setting Automatically renew the software, the part runs like clockwork. Greetings Merlin312ps

This is how the reflashing works with older Fritzes.
With the 7590 A/CH, however, I didn't quite manage it, lost my patience - I'm now exchanging the 7590 A/CH for the 7590 DE version.

Reflash the CH version to the DE version:
Download the latest DE recovery from the AVM ftp server.
Execute recovery, continue according to Wizard instructions until Wizard complains that the FritzBox version does not fit.
Leave screen open.
Start CMD (with right click as Admin)

ftp 192.168.178.1 (the IP shown in the recovery wizard !)
User: adam2
Password: adam2
quote SETENV annex B
quote SETENV kernel_args annex=B
quote SETENV firmware_version avm
bye (only when ready for the next step)
Now immediately recovern with the correct firmware without rebooting the FB.
wait until the automatic reboot is finished

Access the web interface:
Connect the PC to the "LAN 4" port of the FRITZ!Box.
Set up the LAN network adapter to automatically obtain the IP settings (DHCP).
Call up the user interface of the FRITZ!Box by entering fritz.box in the Internet browser. If this does not succeed, try to call up first by entering 192.168.178.1 and then 169.254.1.1 in the Internet browser.

If problems occur, try with reset:
Connect analogue telephone and dial #991*15901590*, then a reset will be performed.

If it doesn't work, go back to the CH version:
Procedure as above, but with the following differences:
Start CH recovery
quote SETENV annex A
quote SETENV kernel_args annex=A
quote SETENV firmware_version avme
bye
Perform CH recovery

Sources:
https://www.ip-phone-forum.de/threads...
https://www.tecchannel.de/a...
http://www.wehavemorefun.de/fritzbox...
https://www.schieb.de/507338...

Ahoy,
I assume that it does not work. At least it does with the 7490. de-recovery-image does not work with a-ch version. It is stopped by the flash tool as not compatible.