Please tell me more about your issue. ?? I tried the light wallet and nothing worked. It seems that I was fooled by bitshares network. They say wrong password but i never changed it. Only after I formated my disk my login doesnt work anymore
This honestly sounds to me like you had wallet account (that requires you to save *.bin file and small password for encrypting .bin file) and you're trying to login using account model (just requires strong password, no file), but because your password is for .bin file (wallet model) it says incorrect password for account model login. you can switch to wallet mode, but you're still missing .bin file, so you're out of luck it seems.
In repeat:
wallet model: username + wallet.bin + password
account model: username + password
using password from wallet model on account model will not work
using password from wallet model on wallet model without wallet.bin file won't work
If you have really old account from 2014-2015, you can follow this guide http://favs.pw/bitshares-how-to-sync-the-old-client-0-9-3c/