Getnet router firmware

hello,

I have this router getnet.com.tw/products_GR-124W.html and the firmware in there is in .img file - but it looks that my router dont know how to use it and I found somewhere that it want a .bin filre

now I have problem that it supports LAN (cable) like before but it cant connect to internet

how to get right firmware or fix this problem?
 
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