Netgear MR6110 Wont Turn On

Hello

Our Netgear Mode No: MR6110 router wont turn on.

We have unplugged the battery, sim card and when we turn on the Netgear lights up and 5g sign, but then shuts down after a few seconds.

We have tried to factory reset, but also does not work. We have also tried with battery included.

The device was offline for a while, so not sure if in sleep mode or some other mode.

Appreciate any help to re-activate.

Thanks

Justin