Why my phone won’t turn on or come off frp lock or recognised by pc?

I flashed sac23 s9 rom 4 days ago now and when it booted up there was no signal so I looked all over the web and couldn’t find much helpful so checked my imei and all my info was unknown so I connected it to my pc and it didn’t recognise it any more it says ‘usb device not recognised , so I uninstalled the drivers and installed new ones and still nothing tried Samsung kies can’t connect and tried to get smart switch as the internet suggested but cannot seem to run it but I no nothing will help so then I flashed through twrp project dream 1.3 rom and same problem so then I just rebooted and then frp lock was on and now it won’t turn on or be recognised by the computer no matter what I try. My model is sm-g935f unlocked and it says binary is custom, system status: custom, frp lock: on, secure download: enabled, warranty void: 1 (0 030c) Rp swrev: B:2 K:0 S:1 So PLEASE PLEASE can anyone help would really appreciate it as I cannot afford to take it to a shop and from what I see online anyone who has they make them replace there motherboard which I don’t no why because it is caused by soft wear not hardwear. Thanks Lisa

I never got it fixed