Default Sequential firmware updates ??

Currently running 5.xx firmware with ARHD 71.1 on UK phone.

I know that I won't be able to jump straight to "L" when it's released because I'll have missed the latest 6.xx update.

Question, if I wait until "L" is released, and return to stock for update, will the 6.xx update still be available so I can update in sequence or will they "delete" the 6.xx update when "L" is released ?

Thanks



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