ADSL2+ Router+Modem recommendation

Hi! I would like to get a recommendation for an ADSL2+ capable modem/router/wifi. I would like to install OpenWRT on it to use the SQM feature. Here's the one I've found so far:
TP-Link TD-W9980, 12€ used
Netgear DGN3500, 12€ used
BT Home Hub 5, but I've only found the type B variant in my country used for 25€.
I'm not an advanced user, I just want to use the SQM feature, so I'm thinking of buying the Netgear DGN3500 as it has more flash (16MB on the DGN3500, 8MB on the TP-Link), but I think the processor of the TP-Link is more powerful, so what should I choose. Also, I saw that the last update that you can install on the DGN3500 is the 21.02.5, which wouldn't really bother me, but I haven't found anything on the last supported update for the TD-W9980.
My current Modem/Router is the TD-W9970 if that help.
Sorry for my English, and thank you reading this and I hope you can help me.

8mb flash devices are EOL after the upcoming release of Openwrt, you'll want at least 16mb.

What are my options for an 16MB flash device with ADSL2+ support, router and wifi please? The Netgear DGN3500 doesn't support the latest update anyway because of the size of the kernel partition.

read and tried the links in the thread posted ?

On this[CPU*~]=Lantiq , only two supports Wifi: the FRITZ!Box 7490, which under "supported current rel" says "PR pending", and the Home Hub 5 Type A which isn't available in my country used market.
What I would like to know is, would a Netgear DGN3500/TP-Link TD-W9980 support openWRT with just SQM without issue ? If I am missing or misunderstanding something here, please tell me, because I can't seem to find a modem/router/wifi with 16Flash/128Ram available in my country that supports OpenWRT with ADSL2+.

For ADSL, you need to take care of the correct annex (as this is determined in hardware at the analogue rf level), this decides if the BTHub5a is an option - or not, if it is, even a moderate markup + customs fun for importing it from the UK is well worth the hassle. The bigger concurrent dual-band Fritz!Boxes (e.g. 3490 and 7490) will always remain 'difficult', with their second ath79 SOC and its communication channel between lantiq and ath79 - possible, but more for experts.

Ok! I've just bought a used Netgear DGN3500 after my last message mainly because another user on this forum (2gr) seems to successfully be using it with OpenWRT. I think my annex is A, as my current modem/router is a TP-Link TD-W9970 and it is setup in Annex A/M mode. If there is any way to be sure at 100% what annex I am using, please tell me. If I have any problem with my Netgear DGN3500, or later when I want to update to a newer version of OpenWRT, then for sure I will be importing a BT Hub 5 Type A. Thank you very much slh and frollic and have a nice day!

Compared to the BTHub5a, that is really unfortunate.

Yeah, that's what I thought too, especially when seeing all the tutorial and support that the BT has. I've cancelled my order and will try to buy one off eBay and import it.

I have a ZyXEL P-2812HNU-F1 running OpenWrt 22.03.3 with SQM.

incorrect, deleted.

I don't understand what you mean.

I don't remember how the Fritz 7520/7530 performed on an ADSL line, there was some discussion about it, but I can't find it at the moment. That would be the most powerful device with DSL support.

Never mind, I read the ToH wrong.

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@ codeugo i would be you, i would buy a cheap xdsl modem, configure it in bridge mode (maybe your isp modem can already do this ?), and buy an additional powerfull router with wifi 6, on which you install openwrt. There are also cheap powerfull routers.
you don't have to stay stuck in those old adsl modem routers...

you have a TP-Link TD-W9970, then you can already configure it in Bridge mode.
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Unless I have missed something, there hasn't been any report of a working ADSL/ATM connection with one of these devices running OpenWrt so far.

At least one user tried it and in that case it didn't work. But it is not clear if this was just because of the known dc_ep_clk_on failed error affecting that particular device, or if there is another more general issue with ADSL/ATM support.

Ah yes, that's the discussion I was referring to, thanks!

I've already bought the BTHH5A on eBay, so I'm gonna try it first. I saw on the 228 (why???) pages long guide of the BTHH5A that it wasn't capable of delivering full 76Mbps with SQM and Wi-Fi activated, so if I have some issue with it, I will use the TD-W9970 as an ADSL Bridge or a Wireless Router, but my internet has never gone past 10Mbps (it is generally around 8 to 9Mbps) so it should be ok. I will keep your solution in mind if I have any issue.

Maximum (theoretical) speed with ADSL2+ would be 24 MBit/s, in practice I've never seen ADSL contracts beyond 16 MBit/s (everything faster than that would be VDSL or VDSL2 (with- and without (super-) vectoring; typically 25, 50, 100, 250 MBit/s) - so there's no risk at all that that BTHub5a couldn't cope with those ADSL speeds (without- or with SQM).

Hello Jan,

I was testing the FritzBOX 7520 and it only was working with the patches you provided. After that the DSL line came up and I did have a working internet connection. So that seems to be related to the dc_ep_clk_on failed issue.
I also experienced low performance but that was related to being WPA3 enabled. After using WPA2 only I got the expected DSL speed which is 50Mbit/10Mbit.

Thanks, Thomas