Please follow the following steps to upgrade u-boot on your board:
1- First download “6x_upgrade” and “upgrade.scr” from the following link:
2- (if you already have a u-boot file of your own that you want to upgrade to, please ignore this step)
Then if you want to upgrade your u-boot to the latest version download the specific u-boot file for your board from the following link: (for example for nitrogen8m board, download “u-boot.nitrogen8m”)
3- Copy “6x_upgrade”, “upgrade.scr” and “your own u-boot file”/”latest u-boot file download in step 2” to the root of an sd card. (If your device does not have sd card slot, copy the files to the root of a usb flash drive)
4- Put sd card inside your board. (or Connect the usb flash drive to the board)
5- Connect the board using the serial cable to your host pc, turn on the board and stop it in u-boot through console on your host pc.
6- Type the following in u-boot:
=> run upgradeu
7- Wait till it finish and then restart the board.
As always, let us know your experiences (both good and bad).