Well out of the box. Fritzboxen with FritzOS do not offer bridged modem mode anymore...
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Oh no! bad assumption on my part =(
Thanks. Amended the post.
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We got a reply 
As long as they're not responding to it before it was amended =(
Check their edit 
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Seems like it shouldn't be an issue.
Edit:
Most, if not all of the 7530s on Ebay will be Zen variants, with slightly tweaked firmware. It doesn't seem to be possible to make them completely stock (I did try) & AVM weren't much help. So not sure if there might be issues trying to flash them. So your question might be better asked on a Zen specific forum.
@moeller0 Do you know anything about Zen variants? Edit 2: Apparently that's an ISP - so an ISP variant.
Edit 3: From what I can tell looking around on eBay, if you look at the label underneath the device, Zen variants will say "Edition Zen Internet" on the black bar. And there are others which don't - meaning they should be plain stock.
Edit 4: Wrong - they're all Zen...
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Sorry, first time I hear of those...but if the German 7520 is the model here this would be the same hardware with a custom tailored firmware for zen and likely the ability to change to stock and/or OpenWrt, nut that is pure speculatin on my side.
Sadly AVM has re-used the model name 7520/ 7530 for rather different devices, so you do need to be very careful when searching for/ buying one of those (make sure that the model plate is visible, so you positively identify the revision). In general, there are three major versions:
- original (yes, some of those need a patched xDSL driver, but that's fixable)
- rev B, Broadcom
- 7530 AX (so wifi6)
only the original variant is supported.
All the ones on eBay are Zen (ISP), which appears it can't be changed to stock firmware.
What do you think of this one?
Edit:
The DSL modem within the D7800 is NOT supported by OpenWrt.
Nope!
There're not only 'Zen-variants' on ebay.
Like this one, it says 'Edition UK':
https://www.ebay.co.uk/itm/326251862790
But nevertheless, i don't think that you can't flash OpenWrt on these models.
I already converted 3 7520 (a special variant made for 1&1), but even on stock firmware they're working fine.
The only difference between the 7520 and 7530 stock firmware is, on the 7520 only 2 of the 4 ethernet ports can be used with GBE, and the USB port runs only in 2.0 mode instead of 3.0.
But on OpenWrt, all these artificial limitations are gone.
I'm quite sure, the same is true for these 'Zen Edition' devices.
Just make sure, you don't get an AX or rev. B.
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I filtered Item Location to UK Only, so that's why I didn't see this one (shipping from Ireland)
I hope so.
AX is easy enough to spot. As for rev. B, the wiki page says that's for 7520. So there is also rev. B for for 7530? And how to spot that (let's take the one you linked for example)?
Ah, i guess i missinterpreted some data...there is a 7530AX-B, which is different from the 7530AX.
But i haven't found any pictures of the bottom label, so i can't tell.
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The wiki says (bold at the end added by me):
Some models of the 7530 have a changed flash chip which is only supported for releases after 22.03 and snapshot builds. There is no known way to identify these boards from the outside. The only known box this happened with was an ISP-branded 7530 (A1).
Do you know what is this A1?
Well, the different flash chip wouldn't be a concern (as that note is mostly present for history reasons), after all you are going to install 23.05.x anyways.
The Broadcom or AX variants are the only real concern, in the sense that those (especially the former) will never be supported.
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So I don't have to worry about rev/type B, or Zen ISP?
You do have to worry about rev. B and AX, those won't work (100% failure rate guaranteed).
While I'm rather confident that you can escape the Zen stuff on the bootloader level (while flashing OpenWrt via ftp), I have no personal experience with those and don't know if they make escaping harder than the ISP versions (e.g. 1&1) in Germany (probably 75% chance of success).
What I said to @elder_tinkerer about rev. B for 7520 vs 7530, is that accurate?
AFAIK rev B applies to 7520 and 7530 equally, it's the same hardware after all (the 7520 is a 1&1 (German ISP) branded variant of the 7530, with a black branded case and additional limitations enforced by the ISP branded firmware to make it cheaper (even with the OEM version, you can unbrand it and regain all features of the 7530)).
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