Need help flashing stock ROM on S8+
I've had this phone for a while now, still working like a beast, but after official android support stopped I started using custom ROMs,
The last one being Lineage OS 20, it's not the official Lineage OS but it was quite stable no issues for a good year or so, but recently had some audio issue where speaker and mic wont work, if i tried to record a video the app just crashes, same for recording audio, taking pictures works fine, bluetooth didn't work either,
After a week or so of trying to resolve this I found someone say TWRP flashing of lineage OS could cause this, its better to flash through adb or cwm, I tried to find cwm I dont even know if it exists anymore, I also read you'll need to flash the stock firmware first then any ROM to fix this issue,
So I went ahead to try and find Stock ROM, my phone is SM-955F Indian version, now I searched hard and wide and could not find the stock ROM only one website had it and that download keeps failing after going at a snail pace for like an hour,
Now I made the mistake of wiping my phone thinking oh ill clear everything keep it ready for the ROM, but several issues happened, I can't really exactly remember the steps I was taking to try and fix things, it was a lot of back and forth but I've now messed up and corrupted the bootloader and got stuck here
I'm really out of ideas here, I'm not sure what to do, if anyone has any way of fixing this, it would be very very amazing!
Note- I do want to mention, after all this it has me wondering if the country version is important, if all it is needed is for carriers, I dont use a sim on this phone anymore, I only use it for extra work so only wifi all the time.