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Changed the bytes as required, make rgn from boot.bin, prepared SD card and update.txt, fw_all.bin and resouces.bin in the root.
I have put the SD card in the slot, started the device, entered pre boot, loaded rgn, unit showed Software Loading, updater said loaded successfully and then loader and that is all.
After 2 min. (just for safety) powered off the device, checked SD card - nothing new on it.
As far as I understand commands if process goes right there should be 41.bin in SD root and update log file in 0972 directory.