How to restore firmware from bootloader shell

setenv baseaddr 0x80600000
setenv flashsize 0x800000
saveenv

mw.b ${baseaddr} 0xff ${flashsize}
tftp ${baseaddr} fulldump.bin
sf probe 0; sf erase 0x0 ${flashsize}
sf write ${baseaddr} 0x0 ${filesize}

• Look up base address value for your SoC in SDK.
• Flash size is either 0x800000 for a 8MB chip or 0x1000000 for a 16MB chip.
• Replace fulldump.bin with the name of your backup file.
• You need a TFTP server with the firmware backup file on it.