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Can't boot into my HP Pavilion

HP Recommended
HP Pavilion 15 - cs0610ng
Microsoft Windows 10 (64-bit)

Hello. I have a HP Pavilion 15 - cs0610ng notebook. I can't boot it, I'm stuck on HP boot animation. It all started few days back when my system started acting all sluggish. After some investigation I've noticed that my hard disk drive is 100 percent utilised. Since that's my second, non-system drive I disabled it in the device manager and I was left with only SSD. Of course, before disabling it I tried all the usual stuff like disabling superfetch, disabling windows search, checking IDE/ATAPI controller, things like that. My laptop was now working almost normaly, with some minor lag here and there, but I still had trouble shuting it down, I had to shut it down by holding the power button. Since yesterday I can't boot it anymore. When I turn it on, I can't access windows recovery. Automatic repair sometimes starts but soon after I am left with the black screen. I can access BIOS, and by pressing f2, I can access HP PC Hardware Diagnostics. I can access both of these but I have to wait couple of minutes every time which is weird. Inside of bios I tried setting all to factory settings but it didn't help. I tried that thing when you hold windows + v key while booting it to reset the CMOS thing. I succeeded but to no avail. Inside of diagnostics I rolledback BIOS, which also didn't help. Also inside diagnostics I did all the System, Symptom and Component tests, all passed with no issues. When I turn it on and left it on a boot loop after some time I get caps lock led flashing 5 times slowly, then 4 times quickly which indicates "System board error. The embedded controller times out waiting for the BIOS to return from system board initialization." In BIOS logs I have 0502 error code which indicates that CMOS checksum is invalid.

My next step was to update BIOS driver via USB flash drive but my other PC is Linux and I'm having trouble creating recovery drive on Linux because I'm fairly new to Linux.

On another USB drive I have notices a folder named SWSetup backup. Quick Google search told me that this is HP stuff. Thought I should mention this.

These are my specs

HP Pavilion notebook with 256Gb SSD and 1TB HDD, i5u 8th gen, Nvidia MX150, 8Gb RAM. It runs on Windows 10, 20H2, OS build 19042.685.

Any help would be greatly appreciated. Thank you.

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