Hi,
I was wondering if anybody has tried installing OpenWRT 23.05.2 or a snapshot on a Fritz!Box 7520, because the wiki article still advises to use 23.05.0.
Greetings, l1n00x
I'm running 23.05.2 on my 7520 since about 5 weeks.
It works flawlessly, i just replaced out of curiosity the dsl-firmware with a newer version.
Not that i can see any difference between them. 
I tried a newer snapshot with kernel 6.1 before that, but then i had no connection between the devices on the build-in switch.
I hadn't much time for troubleshooting, so i went with the stable release which worked fine.
So for now i stay on the stable release.
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Thanks! What newer dsl firmware are you using?
I'm using the firmware from the latest stock version 7.57.
The version number is 8.13.1.10.1.7.
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Could you briefly tell me how I could extract the modem firmware from the image? Thanks!
That's a bit difficult because i don't know which OS you're running on your PC.
I'm using a linux distribution with KDE on my PC, so i can tell you only how i did it there.
If you're using something different (like MS-Windows or Apple), i can't help with these.
The downloaded file from AVM (FRITZ.Box_7530-07.57.image) is a TAR archive.
The easy way on my system: Open this TAR file with either 'ark' or 'xarchiver' and extract the file 'filesystem.image'.
Then open this file with 'xarchiver'. There you go to the directory called 'lib/modules/dsp_vr11/'. Extract the file 'vr11-B-dsl.bin'.
The experienced user may use the manual way:
Untar the downloaded AVM file. Go to 'var/tmp/'. Then mount the file (because it's a compressed file system) 'filesystem.image' somewhere in your home directory. In this directory go to 'lib/modules/dsp_vr11/' and there you'll find the 'vr11-B-dsl.bin'.
I do hope it helps (at least a bit).
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Thanks, I really could have guessed using an archiver first instead of thinking I would need some kind of dd magic (or similar). Seems, the vr11-B-dsl.bin is the same version I downloaded off the web (xcpe_8D1507_8D0901.bin), though the firmwares differ in size. Maybe some AVM tweaks. There is no mention of version 8.13.1.10.1.7. in the kernel log for the AVM one, though. Then there is also ppe_fw.bin and aca_fw.bin. The ppe is from around 2017 vs. the one I am using (FW built Date: 3-25-2021).
That's just the version number (of the modem firmware) that is shown in LuCI under "Status -> xDSL" or with /etc/init.d/dsl_control dslstat.
I even can't remember the version number of the older file.
I just tried this version to see if there's any difference, but in my case it's as stable as the one you mentioned.
I haven't switched the other firmware files.
The Outdoor-DSLAM we're connected to is only a few hundred meters away, but this last part from there inside the houses is quite old telephone cable, buried there about 60 years ago.
I'm on Deutsche Telekom, and instead of DS-lite we've got full Dual Stack with both public IPv4 and IPv6 addresses.
In the last 12 years (or so) we had only 3 cases of non-availability.
2 times with broken hardware in the DSLAM (which took the DTAG a few days to replace it [weekend, of course]) and the 3rd time a few hours when the lines were switched from the old cable distributor to the new one.
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