How to set senao-header for letting update from factory FW

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OK I aligned my FW:

define Device/wlr-4100v1002
  DTS := WLR-4100v1002
  $(Device/dsa-migration)
  BLOCKSIZE := 4k
  IMAGE_SIZE := 7244k
  IMAGES += factory.dlf
  IMAGE/factory.dlf := $$(sysupgrade_bin) | check-size $$$$(IMAGE_SIZE) | \
	senao-header -r 0x0222 -p 0x104A -t 2
  DEVICE_TITLE := Sitecom WLR-4100 v1 002
  DEVICE_PACKAGES := kmod-usb-core kmod-usb-ohci kmod-usb2 swconfig
endef
TARGET_DEVICES += wlr-4100v1002

Leading to this *.dlf (senao-header -r 0x0222 -p 0x104A -t 2)

$ hexdump openwrt-ramips-mt7620-wlr-4100v1002-squashfs-factory.dlf -n 48 -C
00000000  00 00 00 00 00 00 02 22  00 00 10 4a 31 32 33 00  |......."...J123.|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 02  |................|
00000020  00 39 80 04 00 00 00 00  26 f8 99 40 0b 79 6e fa  |.9......&..@.yn.|

to the Sitecom:

$ hexdump -n 48 -C WLR-4100v1002-V1-4-1-24.dlf
00000000  00 00 00 00 00 00 02 22  00 00 10 4a 31 32 33 00  |......."...J123.|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 02  |................|
00000020  00 50 00 20 00 00 00 00  0a 87 d5 da f4 0e 29 72  |.P. ..........)r|
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