Nighthawk M6 Pro MR6400 won't run without battery when tethered to computer

Hi

Can someone assist, I am getting frustrated and purchased this Nighthawk M6 Pro with the below details today on 25 November 2022 here in Melbourne Australia at Telstra shop.

I checked all of the settings in all three hotspots and they are identical. The USB port is set to charging and tethering. However, it does not seem to want to power on without the battery connected when tethered to a PC. I am using the same cable it came with the device to connect to my desktop.

Every time I remove the battery while the cable is connected to the desktop and the device, a picture pop up on the device screen showing (attached picture) the cable can only connect to the device adaptor for AC, and it cannot connect to the PC. But as soon as I install the battery, the device connects to the PC with the same cable.

I don’t wish to install the battery while working at home and want to except for when I will be travelling with the device.

Please provide a solution to this. I believe for such an expensive wireless modem paid $645 (AUD), I would have expected lot more quality and better functionality of Nighthawk M6 Pro.

• MR6500 and SKU (MR6500-1TLAUS_05.00.35.00).
• Purchased at Telstra shop today on 25 November 2022
• Firmware version: NTGX65_10.01.38.00
• PRI version: 01.19
• Chose both option on the Power Manager Settings, but still the device wouldn’t work without the battery

Thanks

Paul