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hello guys, first of all sorry for my bad english, im from germany so pls dont hate

ok im on 4.46 rebug flashed to DEX but lost my flash dump and have ccapi installed.
now i want to upgrade to 4.53 rebug with cobra.
what do i need to do to NOT brick my console? its a nand console from the generation where the nor came out
if you know what i need to do, please help me