If you are here you probably know why you need your Point-to-Point Protocol over Ethernet (PPPoE) password, so I will just explain it right now. Keep in mind that this will work if you have access to the router and the PPPoE password is typed in, but the password is replaced by asterisks or something else. Of course you should first contact your ISP to get the PPPoE password, but if not, not all hope is lost.
type="text"which should turn your asterisks into clear text (it will go back to asterisks when you reload the page).
ISP's can do a lot more to simply block you from using any 3rd party routers than not giving you your PPPoE password. Some routers have MAC cloning feature to bypass one more type of restriction that an ISP can put, but that might not be sufficient for you.
Disclaimer: This is for educational purposes, and I am not responsible with what you do with this knowledge. I did
Huawei HG253s and your results may differ on different routers.