Problem With Boot Manager Monopoly on this Pavillion [edited]

[MrUserFriendly]

Problem With Boot Manager Monopoly control on this Pavillion [edited]. I purchased this laptop for a purpose and do not want the version of Windows 10 that came with laptop installed. So, i put in my own drives, a SSD 1Tb and a M2 500 Gb. I spent half the morning figuring it out partially and can define problem - boot manager monopoly of this machine. Summary: I removed the hard drive and and M2 drives that came with this laptop. I put in my own already loaded drives, an M2 and an SSD. Booting up was impossible, so I figured out (trial and error) that i needed to allow the LEGACY option in bios. But drives were still listed as "boot manager" as the name of the drive(s).  It should be noted that my drives are MBR for a reason.  As soon as i began bootup, the machine processed for 5-10 minutes - i knew exactly what was going on. Since the drive was listed as "Boot Manager," boot manager totally rearranged my boot drive file format to become in Boot Manager mode (GPT format) - which is Exactlay What i Do NOT Want. So, the machine boots up in my separately  licensed Windows 10 Professional now. However, the drives are no longer in  MBR format. I MUST keep my drives in MBR format. Do I need to explain why so that someone will try to convince me that the problem is that I should use the Boot Manager format. I will briefly mention that it has to do with my clone weekly backup system of making clone backup drives and my system of organization of these clone drives. I do not want to discuss that there is a better way by using Boot Manager because that is not what i want. My guess is that the problem may lie in the possiblility that the bios version F.06 may have been Microsoft Boot Manager burnt into the bios preserving the Microsoft Monopoly. This computer is dedicated to music recording and editing and i only go on the internet to install software and updates. I would greatly appreciate some help on this. But before register the W10 Pro, I would prefer to preserve my MBR format. Once i know the problem, i can generate another MBR drive to put in the Pavillion c05641853. I just need to know how to make this bios F.06 to find my drives and not for Microsoft Boot Manager to changemy file format to GPT without my permission. If anyone can help me, thank you in advance.

[MrUserFriendly]

My mistake. This machine model is HP Pavillion 15-cc610ms. But the answer should be the same either way. By the way, this laptop with and SSD and an M2 is extremely fast. I also put 32 Gb on board and removed the 8Gb ddram. It is awesome. I just need to be able to keep my drives in MBR mode and not use Windows Boot Manager.