Dreaded 3F0 error on an old HP Pavilion, but I've put in some effort towards fixing this.

[jcInVirginia]

I'm trying to fix an old HP Pavilion 360 laptop with Windows 10. I know, I know. The thing gives the deadly 3F0 install an operating system... error.
So I have:

Run the H/W Diagnostics UEFI which gives a Long DST failure code of id 9uvu2c-7jxclj-mfpwl1-61ah03. Can't find that explained anywhere, but I bet the explanation of said error would help immensely.

Built a bootable Windows Recovery Env and, via the command prompt, I can peruse the C: file system and it's all there.
Apparently it's not an issue with HDD existence or communications.

Ran bootrec /rebuildBCD   Returned with Scanning all disks for Windows installations. Successfully scanned Windows installations. Total identified Windows installations: 0. Huh, that doesn't look good!

Lastly I ran diskpart, list disk. Got disk 0 online 465GB both Size and Free. Also disk 1 online 57GB Size and 25GB Free. 1 must be my WinRE USB.  Now the confusing part for me. In diskpart the cmd sequence sel disk 0 - list vol followed by sel disk 1 - list vol gives identical answers for both disks. Ltr: C, Label: Recovery, Type: Removable Size: 32GB Status: Healthy. I'm a UNIX guy and I have surrendered. I'm ready to junk this baby. Can anyone tell me what that 9uvu2c-7jxclj-mfpwl1-61ah03 means for my path forward?
Thanks in advance for any help anyone can provide.
V/r,
JC

[banhien]

@jcInVirginia 

Please use the following Guide

                   HP PCs - Hard disk 3F0 boot device not found error

Regards.

[jcInVirginia]

Thank you for the response.  I've done a bit of that but will do it all and in said order soon.

V/r,

John