Thanks. I managed to get the link of the update, then get boot.img then patch it ! So all good.
I did not write back unrooted boot partitions, the update did it so i ended up with unpatched. But then i could not get the boot img to patch it. I tried to get it from the device with Renate EDL tool but it seems that the boot.img i got from it was "small" (30mb while update one is 100mb)
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