Notebook Boot and Lockup

I upgraded my HP- F2C09PA#ACJ (15-n 012tx) with Samsung  860 Evo 250 GB internal hard drive. 

I have used SSD+ Caddy and placed it in place of the optical drive.  After this, I cloned C-drive from HDD to SSD using the Samsung Migration Tool.   (Note: ❗while setting up drive, I chose GPT option)

After this, 

1. I was able to boot from HDD by default.  

2. I was able to boot from SSD if I used "esc+ F9" option to change and select Boot Device. 

2.1)  In my boot devices option- I was able to see 3 options   

              (1)Boot from UEFI File, (2)Notebook Hard drive, (3)Notebook Hard drive. (notebook hard drive option was coming twice, is it weird? ❓)

2.2) here I deduced,  the last Notebook hard drive was my SSD. 

3) boot was successful with  manual selection from SSD.

---- Now I wanted to boot by default from SSD -----

for this, I tried-

4) Changing boot order in bios option (F10)

5) in bios option, I was not able to see the SSD listed in the list of options in  'Legacy' and 'UEFI' boot priority.

5.1)  however, I saw  option of internal CD/DVD drive. Since my SSD was using same SATA point as DVD drive was using- I gave it 1st priority and 2nd to 'OS Boot manager' in both 'Legacy & UEFI' [Here,  Legacy support was enabled]

 --> still it did not work😞

5.2)Again in the bios option,  I disabled Legacy Support and tried  --> Still it did not work, 😞 instead, it was showing - ' no boot device found'❓  What could be the problem in this case?

5.3) Another question- In some videos, i saw that 'OS boot Manager' option was having a little triangle '>'infront of it - upon clicking the OS Boot manager- they could see HDD, SSD.  In my case it was not happening.  Is this also a problem or does it depend on the laptop's manufacturer?

------------- One last option tried---------

6. Since, I am able to boot from SSD using esc+F9 - i.e. by selecting manually the boot drive- 

I thought - if boot from SSD then deleting the HDD's OS installation partition could make the bios see- only one bootable drive and it would boot from the SSD.  Same I read somewhere in other forums. 

7. So, I did exactly, I booted from SSD then I formated the partition of HDD where windows were installed.   (btw, while formating it told that the partition is in use 😁) 

8. after formatting, I tried rebooting -->   it did not work!!!  😐  . 

9. rather, I saw a blue screen- saying  'Recovery' -  'your PC needs to be repaired'

10. After this, I tried again using esc+ F9

10.1)  Here, again, I saw Notebook Hard Drive twice (same as mentioned in (2.1) ). Again I selected, "Notebook hard drive" to boot from SSD.  -> thankfully, at least i was able to boot into the OS  from SSD (Although manually again!) 🙄

-------------

11. I am trying not to replace the SSD with HDD physically - just because its difficult and doing it by self is risky and I am not sure that would work. 

------------- Now hopes on this forum -----------------------

Can anyone suggest a solution?     

(Is there any issue because of  using GPT instead of MBR? )