```
root@odroidc2:~# strings /dev/mmcblk1 | grep 'U-Boot 20'
U-Boot 2020.04-armbian (Dec 12 2020 - 00:07:49 +0100) odroid-c2
root@odroidc2:~# cat /etc/*-release
# PLEASE DO NOT EDIT THIS FILE
BOARD=odroidc2
BOARD_NAME="Odroid C2"
BOARDFAMILY=meson-gxbb
BUILD_REPOSITORY_URL=https://github.com/armbian/build
BUILD_REPOSITORY_COMMIT=b9814056
DISTRIBUTION_CODENAME=focal
DISTRIBUTION_STATUS=supported
VERSION=20.11.3
LINUXFAMILY=meson64
```
How can I upgrade the U-Boot to U-Boot 2021.04-rc3-armbian (Mar 08 2021 - 18:48:25 +0100) odroid-c2?
I tried sudo apt get & sudo apt upgrade -y but it didn't update the U-boot.
