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Legacy BIOS Wont show on Exernal Screen.

HP 250 G3
Microsoft Windows 10 (64-bit)

Hello guys. I really need help.

Is it possible to show the legacy bios on external screen?
my screen is broken since i dropped my construction tools above it. 
I was able to use the laptop again b removing the primary display cable then using external display via VGA

it was running an old HDD with windows 7 Legacy on it and was slow. When i'm using it. I wont see the POST at all and onl the OS User Login Screen. I tried to use my brother's SSD, made a 2.0 bootable drive. those two are working since i tried it to different computers but after i changed the bios to legacy from uefi. it wont display at all. i know i still need to put the 4 numbers + Enter to able to change it completely but how can i do that when there's no display. Right now i manage it to get back to EUFI by blindly pressing the reset BIOS. 

I really need to fix my laptop, im on 3rd world country and really affected by pandemic. I don't have any work rn other than online stuff. Wish you can help me HP 😞 

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Legacy BIOS Wont show on Exernal Screen.

Or is there any way to remove the Operaing System Boot Mode Change (021)?
So i don't have to put the code anymore and set the boot priority while in UEFI .

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