When I upgraded to 18.06.7 I had an issue with DHCP6 not getting the statically leased delegated prefix. I checked with my ISP and it seemed that DUID of OpenWrt changed, hence the DHCP6 server had to wait until the lease expired and only after that it gave me again my prefix.
I tried to find where the DUID is stored, but I wasn't lucky. Does anyone know where it is stored or how can it be kept over flashing a new image?
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After a bit of search it seems that the option clientid is the one I was looking for. And now off to another problem in a new topic 
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