Asus N550jk Bios Problem (Wrong Bios)

hi , thank you for your time

i have Asus n550jk . my hard drive was infected with bad sectors which led to system being still on windows logo, and although i managed to revive it once myself , it suffered the same faith again a few month after . at the time my finances wouldn't allow me to send it for repair ( guaranty was expired by then) so i let it sit and used it mostly as a usb hub for charging my phone or portable speaker for about two year , anyway last month i finally send it for repair at a local repair shop , it took them 3days to inform me that my hard-drive was out ( which i already knew and had told them at the Beginning - looking back this should have been my first alert ) , so i asked them to replace it with a 2t hard drive ( the original was 1t ) and setup a win10 on it ( original was 8.1) , it took them about 10 days to buy and replace the new hard-drive which should have been my second alert , at last since my persistence to get back the laptop , they called me to get it . when i was testing the pc i found out first they setup a 8.1 win ( my third alert ) and second my geforce 850m gpu is not recognized by system , so when i asked them they told me that its no problem ?!!!! and if i want to have it fixed they at least need 3 more weeks . so i took the laptop home and after quite few attempt to manually install the nvidia i noticed that the idiots have flashed the wrong bios on my system ( n550jv instead of n550jk ) . trying to use asus ezflash and winflash to correct their mistake , it says the wrong model bios cant be install . and i'm sure you can understand why i rather to throw the laptop into fireplace instead of sending it back to that idiot squad . i found this topic here that you guys helped someone to fix the same issue they had
https://www.bios-mods.com/forum/Thread-H...del?page=5
so i am coming to you for help . any help would be appreciated 
if you need any additional info just ask .
thank you for your time