I need help with router netgear M1

[bigpop445]

I have a problem with the M1 router
After update to version 10.25.1.1, the wifi is very slow and when using the cable the speed is normal
The previous version did not get this problem and the internet speed through the wifi was excellent

MODEL: netgear nighthawk m1 telstra unlocked

[mdgm-ntgr]

Which firmware did you update from?

Have you tried resetting the system to factory defaults?

Are you using a Telstra SIM?

[bigpop445]

1 - 

The old firmware is NTG9X50C_10.12..02.01

Now the firmware used is 10.25.01.01

 2 -

Yes, I did that

3 - 

No I am using another telecom company

I tried more than the telecom company and the problem still exists