Unable to toggle boot between Mint 20.2 and Win10 in grub menu?

Recently installed Mint 20.2 alongside Win 10. Both systems show in the grub menu but I am unable to select either and system automatically boots into Mint? Mint appears to recognize w10.
Any ideas?

steve@steve-G41MT-D3V:~$ sudo update-grub
[sudo] password for steve:
Sourcing file /etc/default/grub' Sourcing file /etc/default/grub.d/50_linuxmint.cfg’
Sourcing file `/etc/default/grub.d/init-select.cfg’
Generating grub configuration file …
Found linux image: /boot/vmlinuz-5.4.0-74-generic
Found initrd image: /boot/initrd.img-5.4.0-74-generic
Found Windows 10 on /dev/sda1
Found Linux Mint 20.2 Uma (20.2) on /dev/sdb5

Try to boot without any peripherals attached, except the keyboard.
If it still does not work, try re-plugging the keyboard, when in the GRUB menu.
If it still does not work, try using a different keyboard.

I often had an issue, where the keyboard did not turn on quickly enough. This can have different reasons.

Sounds like a plan. Wireless keys and Mouse. Is it possible to extend the time in the grub screen before bootup?

New batteries in the keyboard and mouse might help