Laptop overheating after Bios update 1.9.0

Hi first time on any forum. Can't find any help regarding my issue so I decided to join this community hoping for the best.

Now the issue. I have a Dell Inspiron 5559 i5 6th gen that I got in 2015 and its been looked after and runs totally fine. About a year ago my laptop started getting overheated while gaming and later the fan totally stopped working and it would self shut down. I opened the laptop and cleaned it (after 5 years for the first time so you can imagine what I found in the fan and the vent). The thermal paste was dry as dust(like Thanos snapped it out of existence), so I replaced it hope to fix my overheat issue. However it did not.

Some more searching later I read some where that bios update can fix these types of issues. So I installed the latest bios update 1.7.0 at that moment from dell support site and very happily it fixed my overheat issue(tip for anyone having this issue try updating to latest bios) and It worked totally fine until … Last week where I decided that it will be good to update the bios again to make the system perform better(I'm always looking to improve the system and to keep it up to date).

However when I updated from 1.7.0 to 1.9.0 bios, the overheat issue is back, the fan runs very loud and fast. I went back to 1.7.0 (which downgrading is blocked by dell but I still found a way which is not easy at all but worked), then tried resetting bios to default setting as well on 1.7.0(which does not change the version just resets bios settings). But the problem isn't fixed from downgrading at all this time but it did improve the run time. Because on 1.9.0 my laptop would shut down after 10-15 mins of gaming while on 1.7.0 it took over an hour to overheat(the fan also isn't as loud or fast which is good) and shut down. Since I have already encountered this problem and it was fixed via software, so I know this is not a hardware problem of any type.

All the solutions I find online are hardware related, but I required a software solution. 

Thanks in advance to anyone who read thought this and especially tries to help.