Default [Q] how not get bricked

N7 2012 w/ cm11
i booted bootloader with the intention to flash factory image nakasi-kot49h-factory-5e9db5e1
on flashing the bootloader, i got an error
i am not sure if i have also done a
> fastboot erase bootloader
without ever rebooting the tab, I have tried to write many different versions of bootloader files. none would write; now i get the error
writing 'bootloader'...
FAILED (remote: (Unknown error code))
how can i know if i can(will) boot back to bootloader?
complete story at

thank you