[操作疑難] 求救!!關於TPLINK-wr740n FLASH dd-wrt

麻煩咁多位師兄幫幫手,話說我一向都用隻wr704n router上網,
尋晚手多多,flash 左去dd-wrt,
flash完隻router之後,可以好正常咁連到去192.168.1.1(部PC亦都拎到個IP 192.168.1.XXX)
但係當我打完pppoe個account之後,再按save setting,佢之後就連唔番入個192.168.1.1,(但係睇番個IP都仲係192.168.1.xxx), 每次遇到呢個情況,都要禁個router既reset制先可以重新入番去控制版面.
我試過直接插PCCW 隻modem落PC, 開個新既網絡連線係上到網既.
麻煩各位幫幫手... 尋晚搞左我成晚都搞唔好.