if [ "$magic" = "4349" ]; then
local kern_length=0x$(dd if="$sysup_file" bs=2 skip=1 count=4 2>/dev/null)
- [ -f "$UPGRADE_BACKUP" -a "$UPGRADE_OPT_UPGRADE_OPT_SAVE_CONFIG" -eq 1 ] && append="-j $UPGRADE_BACKUP"
+ [ -f "$UPGRADE_BACKUP" ] && append="-j $UPGRADE_BACKUP"
dd if="$sysup_file" bs=64k skip=1 2>/dev/null | \
mtd -r $append -F$kern_part:$kern_length:0x80060000,rootfs write - $kern_part:rootfs
local board_dir=$(tar tf $sysup_file | grep -m 1 '^sysupgrade-.*/$')
local kern_length=$(tar xf $sysup_file ${board_dir}kernel -O | wc -c)
- [ -f "$UPGRADE_BACKUP" -a "$UPGRADE_OPT_UPGRADE_OPT_SAVE_CONFIG" -eq 1 ] && append="-j $UPGRADE_BACKUP"
+ [ -f "$UPGRADE_BACKUP" ] && append="-j $UPGRADE_BACKUP"
tar xf $sysup_file ${board_dir}kernel ${board_dir}root -O | \
mtd -r $append -F$kern_part:$kern_length:0x80060000,rootfs write - $kern_part:rootfs