i am having trouble doing this method on the samsung tab s8 ultra. i tried the usual method that is most discussed on xda developers which is to download the stock firmware files, extract the firmware files, and extract up_param, however up_param wasnt a file in any of the stock firmware files (usually it is in the AP archive). i got excited when i found your method here so i gave it a try and i found the file in /dev/block/sda7 however when i try your method and when i try to unzip or open the archive with 7zip (or any program) then it says it is corrupted and i cant view or edit any of the files
