@David-TP 

M8550 can combine with certain bands up to 5 bands in Download (DL) using Carrier Aggregation as far as I understand it by the file provided. See attached filtered for 5DL: 

 

Thats surprisingly good if correct. I was expecting lower CA results given the device "only" supports 3GPP Release 16. Honestly I would have expected 3GPP Release 17 or 18 as given with such CA results. Maybe the information about 3GPP 16 is wrong? Anyways on the CA side it is good news :-) 

Please note, I´m not a technician. Maybe I´m also wrong with my statements.  Thanks to confirm therefore.

  @LutzB I cannot even get mine to connect.  It just keeps cycling through the connecting phase after eliminting the string errors after downloading the file from my Draytek.  

On this basis, I'm sending mine back with the marketing hype on this "tri band" (but not simultanesly operation), I may as well get something a bit more reputable for the money.  I managed to get a re-badged AMIT with firmware fixes to at least dial in to a server and work two ways, this is looking very much like that situation where they fix one thing and introduce half a dozen problems, albeit breaking what was once fixed.  Shame becuase the unit itself looks nice.   

  @David-TP 

Thank you for coming back to me.  

If I could get this working, I'd be willing to keep the product.  I'll check my messages and test the firmware.  

Grateful

Pete

  @David-TP 

Hi David

Many thanks for coming back to me, I will try this out.  I believe Evan (in the other post) is still struggling to establish a tunnel.  

Tried to reply to your message, but it wouldn't let me due to a lack of following.  

Regards

Pete

  @David-TP 

Hi David

I'm not sure if you have seen my post in the other thread, but to just let you know that my M8550 is on its way back to my supplier.  Many thanks for your time to come back to me, but I feel my days of playing Guinea Pig are over.  

This morning I thought I'd piggy back to my home router to save pulling the Sim card out of my mobile phone and upload the firmware.  The unit decided to connect and disconnect when it felt like it, and I really feel disapointed at the price point.  

Please see the post with @ 

Regards and thanks again

Pete 

  @David-TP 

Just got the M8550 yesterday and am running into all the same problems mentioned here, especially with the VPN functionality. Followed Pete's and Evan's thread linked above and installed the beta firmware (M8550(EU)v1_1.3.0_3.0.0_Build_260126_Rel.57813n_UP_BOOT_beta_2026-01-27_10.20.00). Now I *can* establish a tunnel but with problems:

1. WireGuard config is still not loaded properly and sets MTU to 0 and one of the DNS values to "d" (!??)

2. The "Allowed IPs" section for the VPN Client WireGuard configuration seems to be completely ignored

3. Can't view any devices on the VPN (the same WireGuard config on another device lets me see them)

4. Backlight turns on randomly even when the screen is black

5. Device gets very warm and loses battery very quickly (50% in 3 hours) with just 2 clients

Not to mention the weird "Tri-Band" marketing which allows 5/2.4 and 6/2.4 but not actually 6/5/2.4 simultaneously.

Is there any hope for site-to-site VPN?

Is there any hope for WiFi offloading (instead of just via Ethernet)?

Is there any hope for proper WireGuard support?

I first tried the Nighthawk M7 and returned it because it had zero VPN client support. Thought this might do better but seeing all my problems being reported in August already and still not being fixed many months later for what is claimed to be a flagship product, I feel like I made the wrong decision again.