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Solved
Slow speeds on MR6500
I do now have a stable MR6500 but my download and upload speeds are seriously slow using the current firmware version: NTGX65_10.04.22.01 and an AT&T sim. The device is unlocked so I tried a T-Mobile sim and found that I could achieve approximately 120 MBs download. With the AT&T sim installed I get no more than 8.5 MBs and usually much lower. In both cases I have very good signal strength at 5 bars. I have not been able to get the device to update to any newer firmware since it states that it's up to date and has no provision to check for updates. Any idea why my M6 MR6500 on AT&T is so slow?
After a new software update and realization that AT&T does not provide as fast download speeds as T-Mobile, I'm closing this discussion. The MR6500 may be a good device, but AT&T's infrastructure is woefully lacking in performance.
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As additional information, in both cases I was on a 5G connection with the device in the exact same position. I do have a model.json file with the AT&T sim installed.
Strange that a device that's intended to operate with AT&T has lower performance when connected to AT&T vs T-Mobile.
In comparison, my Inseego MIFI X Pro 5G is seeing approximately 238MBs with the same T-Mobile sim installed.
Any help would be greatly appreciated.