Re-reading this thread, there are so many variables in the melting pot and possible lines of enquiry. Here's my take - feel free to shoot it down.

1) We have New Moon on PlusNet and parklife on Vodafone - both with problems. Does this not rule out anything to do with Zen firmware (if indeed there is such a variation in the Zen 7530) or their configuration ? If it was down to Zen firmware or their configuration then surely there would be more complaints out there ? Again, IMO, rules out Zen firmware and configuration stuff

2) Seems not to affect those using an external modem - FTTP etc. So conclusion - DSL perhaps is the cause but not the underlying reason.....

3) Handling the DSL line, tracking it's ups and downs in terms of profiles etc stability etc, error correction etc etc This heavy-lifting is handled by a SoC (System on a Chip) but read on.

4) There are two different h/w versions of the 7530 out there. The main difference (to my untrained eye) is that the SoC (system-on-a-chip) that handles ADSL/VDSL changes.

5) It would be interesting to know if those having problems have the same version of the 7530...perhaps the original version with a lower performing SoC ? We have no way of knowing and one would hope that AVM keep a record and that it could be found by using the serial number. If it turned out that we were all on 7530v1 then there's the problem. The v1 needs extra processing/memory outside the SoC but, after v8, the 'reserve' available for this is iffy and perhaps we get memory leakage, out of bounds sort of stuff and a reboot.

But then again...what do I know !

Just my two ha'porth.

Message from Zen (on Twitter - I always DM them if I have an issue):



Thank you for reaching out. Yes, the latest update has been temporarily blocked as it was causing issues for a percentage of Fritz!Boxes. This will be unlocked again once AVM has the latest update.

I hope this helps.

Thanks - Gavin

Because I don't know what proportion of Zen users were issued the 7530 vs AX or something else nor how many people defer the auto updates, nor how quickly they made that change in their management system, I have tried to hold off from further speculation that would require inside knowledge.

I did post on the main site news article that Zen would have been more transparent to post a very specific stat so I won't duplicate that here.

Your comment re stats made me think. Zen were very quick to say that it was 0.5% or somesuch. Expanding on my last post, posit Zen know just how many 7530 v1's they have installed out there. And maybe 0.5% of the userbase ? Just saying.....

I've been in touch with Zen over several days as I also have this issue with frequent reboots since it updated to version 8.00 of the software (I have a regular 7530, not the AX version). The most recent advice they've given me is to factory reset the router. I've seen some comments that people have factory reset but been no better off so this is discouraging me.

Has anyone done a factory reset on a regular Fritzbox 7530 and got a stable connection after?

Your post is so profoundly depressing because Zen really still hasn't done anything to brief their support people. They seem intent on a race to the bottom to get a 1* rating with all the Award people..

No, a factory reset does nothing to resolve this. The best option to increase the gap between reboots IMO is to reduce the load on the router by, for example, disabling either of the wi-fi channels.

Mine was factory reset by a Zen service agent over two weeks ago, to no effect. They've since swapped my early 7530 for an AX (which is running 8.0 with no issues).

Edited by GavinMH (Wed 30-Oct-24 18:43:57)

The factory reset and also reverting to "older DSL format" did not help for me either.

Zen have sent me a 7530AX, which fixed it immediately, and also gives me WiFi6 functionality in my whole house. Previously I only had that from my FritzExtender 1200AX.

I suspect Zen are going to have to upgrade all their old 7530 customers to the AX model if they are going to save their reputation. It does seem to have been badly handled.

Luckily I have no complaints about the service I received, and will be staying with them at least for the time being.

I went through all the troubleshooting (factory reset, building settings manually a bit at a time) and it didn't help.

Push for an AX. It's much better. Totally stable, much faster UI which builds confidence in it's ability, and my mesh hand-overs now work perfectly even during a WiFi phone call.

7530 OS 8 update, massive instability.
2 weeks of bull from Zen, finally they send a replacement router out, an old 7530 as they gave used all the AX's for other people. At this point I care little as I'm already moving.
Replacement router arrives on OS 7.59, runs fine for 2 weeks.
Last night despite me thinking I'd found the right setting to prevent auto updates, it auto updates (that'll teach me for not checking every sub-menu ion the UI and trusting that Level 1 or whatever did the right thing).
This morning, crashes twice within 20 minutes as soon as any load hits in.
Zen support has been shambolic during this, I look forward to no longer having to use them or their AVM hardware.
1 week till I move ISP, I hope they can tell their which one is their elbow and which isn't!