Acer Connect Enduro M3 – extremely slow download when sharing internet with router Beryl AX

Hi everyone,

I'm having an issue with my Acer Connect Enduro M3 and I wonder if anyone else has experienced the same.

I bought this router primarily to use it as a mobile internet source for my travel router – a GL.iNet Beryl AX. However, there's a major issue:

When the Beryl AX connects to the Acer (either via Wi-Fi or USB tethering), upload speeds are fine, but download speeds drop to ~1 Mbps, sometimes even lower.
I’ve tested this in multiple locations with good LTE/5G signal.
When I use any other internet source (phone hotspot, regular Wi-Fi, other LTE routers), the Beryl AX performs perfectly – so this is not an issue with the Beryl router.
The Acer M3 itself works well when sharing internet directly to a phone or laptop – only when another router is the client, the problem appears.

I’ve already:

Updated the firmware to the latest version
Performed multiple factory resets
Tried both USB and Wi-Fi modes

Has anyone used the Acer M3 in a similar way with a travel router or repeater? Any ideas for solving this?

Thanks in advance for your help!

Accepted answers

All comments

StevenGen

https://community.acer.com/en/discussion/723895/acer-connect-enduro-m3-extremely-slow-download-when-sharing-internet-with-router-beryl-ax

The Acer Connect Enduro M3 is probably not compatible with your GL.iNet Beryl AX router, that is why and the only thing that I can put that down to. Use only the Acer Connect Enduro M3 5G Mobile Wi-Fi on its own to connect to the Wi-Fi network.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

mszyplinski

https://community.acer.com/en/discussion/comment/1337054#Comment_1337054

Thanks again for the reply – I really appreciate you taking the time to respond.

I’m open to the idea that USB tethering may have limitations or might not be fully compatible with all client devices – even though it’s interesting that upload works fine, which makes it harder to blame the hardware alone. But okay, let’s set USB tethering aside for now.

What I really don’t understand is this:

The Wi-Fi network shared by the Acer Connect Enduro M3 works fine with phones, tablets, and laptops.
But when I try to use that Wi-Fi as a WAN source for another router (GL.iNet Beryl AX in this case), download speeds drop to 1 Mbps or less, while upload stays normal.
The same setup works perfectly with any other mobile hotspot, home router, or even tethered phone.

So if both routers are using standard Wi-Fi protocols, and the Beryl AX can successfully connect and authenticate, there’s no logical reason it shouldn’t work – unless something in the M3 firmware is causing the issue. Possibly a problem in routing, NAT, or QoS.

Also, with all due respect, the suggestion to “just use the Acer M3 directly” and avoid using a second router isn’t really a solution – it’s more like a workaround. It doesn’t solve the underlying problem. Travel routers like the Beryl AX are used by many people who want to:

Share VPN across all devices,
Extend limited Wi-Fi range,
Add firewall and DNS-level protection,
Connect wired devices (via Ethernet port),
Maintain consistent settings between locations.

That’s exactly why I bought the Acer M3 – and it should support this use case.

I've reported this to Acer support already, but if anyone in the community has ideas, workarounds, or technical insights – I’m all ears.

Thanks again!

ankurpandeyvns

happening the same with me but with wifi it's working fine on beryl.

mszyplinski

https://community.acer.com/en/discussion/comment/1337658#Comment_1337658

Hi!
Thanks for your reply – it’s really helpful to know I’m not the only one seeing this issue.

Just to clarify:

When you connect your Beryl to the Acer M3 via Wi-Fi, you get normal download and upload speeds, right?
Did you have to change any special settings on the Beryl AX (like MTU size, Wi-Fi mode, DNS settings, etc.) to make it work properly?
Also, which band are you connecting over – 2.4 GHz or 5 GHz?
In my case, I tried both bands, but I always get around 1 Mbps download no matter what I do.

Would really appreciate it if you could share any specific configuration you’re using!

Thanks a lot!

ankurpandeyvns

I didn't change any specific settings, my M3 is on 5ghz mode only and it's working fine with beryl. The only thing that I noticed with USB Tethering is that the speeds come back fine when I use VPN on the beryl. But without VPN the speeds are not fine. I'll come up with this issue with the support for GLI.Net support and see what they have to say

Axxo

Slow downloads when sharing internet from an Acer Connect Enduro M3 with a router could be due to several factors, including background processes, network driver issues, or interference. Troubleshooting steps include checking for background downloads, updating drivers, clearing browser cache, and reducing network interference.

Background Processes and Bandwidth Consumption:
Check for background downloads/updates:
Ensure that no programs or applications are running in the background that might be consuming bandwidth, such as software updates, cloud sync, or large file transfers.
Monitor network activity:
Use Windows' network monitoring tools (like Resource Monitor or Task Manager) to identify which processes are using the most network bandwidth.
Network Drivers:
Update network drivers:
Outdated or corrupted network drivers can lead to slow speeds and other network issues. Download the latest drivers for your Acer Connect Enduro M3 from the manufacturer's website or use Windows Update.
Check driver version:
Ensure you are using the latest version of the drivers. You can find the version in Device Manager.
Browser and Cache:
Clear browser cache and cookies: If the slow download issue is only affecting browsing, clearing your browser's cache and cookies may help improve performance.

——————————————

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful.

mszyplinski

Hi everyone,

After days of testing and working closely with the engineers at GL.iNet, I want to share a confirmed and reproducible issue with the Acer Connect Enduro M3 that affects compatibility with devices like the Beryl AX (MT3000) – and likely other routers and advanced networking setups.

❗ The issue:
When using the Acer M3 as an internet source (Wi-Fi or USB tethering), and connecting through another router (e.g., Beryl AX):

– Upload speeds are normal
– Download speeds are severely limited (~1 Mbps)
– This happens even with excellent 5G/LTE signal
– The issue occurs over both 2.4 GHz and 5 GHz, and over USB tethering

🧠 The discovery:
With the help of GL.iNet support and detailed packet capture analysis (Wireshark), we discovered the root cause:

– Acer M3 throttles TCP packets over IPv4
– UDP packets are unaffected
– IPv6 traffic is also unaffected

That’s why:

When I use a VPN (e.g., WireGuard) – which runs over UDP – download speeds return to normal

When connected directly to Acer from a PC (which defaults to IPv6), there’s no issue

But when using another router (e.g., Beryl) as a repeater or WAN client, and that router uses IPv4, the download is broken

This matches exactly what another user @ankurpandeyvns wrote here – speeds come back when using VPN. We now know it’s because VPN forces UDP and bypasses the flawed TCP IPv4 behavior in the Acer M3.

🧪 Verified tests:
– Disabled IPv6 on a PC → download drops to ~1 Mbps (even when connected directly to Acer M3)
– Used VPN directly on PC → download returns to normal
– Repeated the same with Beryl AX in repeater mode → exact same results
– Captured packet data confirms: good speed = IPv6 or UDP, bad speed = IPv4 TCP

🔧 This is a firmware-level issue on the Acer M3
There is nothing wrong with the Beryl AX or the network setup. The Acer M3 mishandles IPv4 TCP traffic, possibly due to QoS, NAT or misconfigured packet handling in the firmware.

📬 What now?
– I have reported this to Acer Poland’s technical support, but haven’t received any feedback yet
– If anyone knows how to escalate this to the global/international Acer firmware team, please share it here – we would really like this fixed in a future firmware update

I’m also happy to share packet capture data with Acer developers if needed – I’ve done all testing and documentation together with the engineers from GL.iNet.

✅ Why this matters:
This bug affects:
– Anyone using a second router with the M3 (travel setups, VPN routing, etc.)
– Anyone relying on IPv4 in non-VPN scenarios
– It leads to a broken download experience, unless IPv6 or UDP-based VPN is used

Let’s hope this can be resolved – it’s a great device in other aspects, but this bug severely limits its use for tech-savvy users.

ankurpandeyvns

https://community.acer.com/en/discussion/comment/1339099#Comment_1339099

Hey! Superb you were able to pin point the issue. Please provide me with the email that you sent to acer technical team, I'll try to email them too.

ByteBuster

Good work @mszyplinski

I have the exact same problem with the Acer M3, but using it with an Asus router.
Was using it as a secondary Wan when having issues with the ordinary isp. Worked fine with the phone tethered and using the same sim-card. Good to see that there are some workarounds to try.

Hopefully this will be solved at next firmware upgrade.

AndyBr

I also bought the Acer M3 specifically to use it with my ASUS router. The error should be fixed as soon as possible, as the M3 is of no use to me at the moment.

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