dell 3100 cannot get login shell after converting to developer mode

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Sorry for the slow response. I live completely off-grid, and only have internet access thru coffee shops. Thanks to covid quarantine this now entails standing outside my local slowly freezing.

 mfg yr 2021

The situation has changed since I made the 1st post. I am working from

https://wiki.archlinux.org/index.php/Chrome_OS_devices#Enabling_developer_mode

I have enabled Developer Mode, restarted, accessed Superuser Shell with Ctrl-Alt-F2, and as user chronos  did

crossystem dev_boot_legacy=1

and rebooted

At the white splash screen I pressed Ctrl-L  and it displayed 2 lines on black background

Press a number key for alternate boot loader

2 Tiano alternate boot loader

Pressing 2 (nor any other key) produced no result, screen seems frozen.

addendum to previous post: The Ctrl-Alt-F2 login advises that if I login as chronos root and do the command 'enable_dev_usb_boot', I will be able to boot from usb stick if I press Ctrl-U in the developer screen.

I ran the command and it completed normally, saying legacy boot is enabled. Restarted with usb stick inserted and pressed Ctrl-U at the white splash screen (OS check is OFF screen). System beeped. Pressed Ctrl-L instead, received message that legacy boot NOT enabled. Waited for the 30 second system beep and transfer to Developer splash screen and tried Ctrl-U again, but again got beep.

I have a Dell 3100 Chromebook that is enterprise. How do I remove enterprise I tried chromes recovery but once it asks for wifi it loads enterprise again. Be a blessing if anyone can help please 🙏