Inspiron 5505 no bootable device

I have posted a related question under SupportAssist session:

https://www.dell.com/community/SupportAssist-for-PCs/Inspiron-5505-no-bootable-device-after-installing-SupportAssist/m-p/8405506#M94892

I'm posting the question here with update thinking it is more related to Bios settings. 

Background: the pc came with a 250 GB ssd (HD0) and Win10 home. I added a 2TB ssd (HD1) and installed Win10 pro to this HD1, removed the Win home, later upgraded to Win 11. Recently the touchpad had no response so I reinstalled Win 10 pro thinking a Win11 upgrade was the cause, but this didn't fix the touchpad problem. Then I came to dell.com updated the drives and installed Dell's SupportAssist and a new problem appeared. 

Now "no bootable device" shows on startup. Below is the list of settings in bios and the things I have tried according to the info I learned:

•  Originally there were choices of UEFI and Legacy under the "Boot" tab, I wasn't able to change the order but could delete the UEFI and start Windows. But I need to do this each time I reboot the PC bc UEFI would come back.
• deleting "legacy" was saved in the bios. Now I have to manually add "legacy" to the boot option and deleted UEFI each time I reboot the pc. 
• No help with disabling "Secure Boot". No "advanced boot" option available to add legacy. The Boot tag remains the same. "Secure Boot" cannot be enabled back after I changed "Select Secure Mode" to "Audit Mode"
• I've tried several Bios versions including v1.0 (newest v1.12) without help. They all looked same and updating the Bios didn't change the settings. 
• I removed HD1 reinstalled Win10 on hd0 hoping Windows can re-establish UEFI booting but this didn't fix the problem. Now the system asks for Bitlocker recovery keys because one system is linked to my company's MS account. 
• The "F9 setup defaults" option only changes "Fast Boot" options to "Minimal" without any help. 
• The touchpad sometime works sometime not during the troubleshooting. Luckily it works now.  
• There are a few related pictures in the original post if they are helpful.

Any suggestions are greatly appreciated!