Reuse old router

Hi All,
I am having 2 old Huawei hg630 v2 and Tenda d151 router proved by Airtel for the broadband connection some years back. Any suggestions how can I use it. I am trying to make it work in bridge mode but it is not able to connect with my existing connection. Not able to change the firmware
 
If your only purpose is to share internet over, then you don't really necessarily need to put it in bridge mode. Just plug a cable from existing router's LAN port to this router's WAN port and assign a different subnet which does not conflict with the other router's subnet. Should work.
 
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