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R6900 no internet after recent firmware upgrade

Right after recent firmware upgrade 44, my R6900 can not connect to internet. It can not obtain IP address from the cable modem.

I tried the other router, works fine.

When R6900 connects to the other router, it obtains IP address, and able to connect to internet.

 

Any ideas how to fix it?

 

Thanks

 

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Re: R6900 no internet after recent firmware upgrade

What is the Mfr and model of the ISP modem? 

 

Try loading the prior version of FW and load it using IE11 or FF browser using a ethernet connected PC. 

 


@Mhfengwrote:

Right after recent firmware upgrade 44, my R6900 can not connect to internet. It can not obtain IP address from the cable modem.

I tried the other router, works fine.

When R6900 connects to the other router, it obtains IP address, and able to connect to internet.

 

Any ideas how to fix it?

 

Thanks

 


 


My Setup (Cable 900Mbps/50Mbps)>CAX80>XR450 v2.3.2.106(Router Mode)>RBK853 v3.2.11.2(AP Mode)
Additional NG HW: C7800/CM1100/CM1200/CM2000, Orbi CBK40, RBK853, R7800, R7960P,
EX7500/EX7700, XR450 and WNHDE111
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