daybreak.ps1

$hactool = "$PSScriptRoot\hactool.exe"
$prodkeys = "$PSScriptRoot\prod.keys"
$firmware = "$PSScriptRoot\Firmware 10.1.0\"
$files = Get-ChildItem $firmware -Filter *.nca
$numfiles = 0
foreach ($file in $files) {
    $hacout = & $hactool -k $prodkeys -i $firmware$file | Out-String
    if($hacout -like '*Content Type:                       Meta*') {
        Get-Item $firmware$file | Rename-Item -Path $firmware$file -NewName { $_.Name -replace '.nca','.cnmt.nca' }
        $numfiles++
    }
}
Write-Host "Renamed "$numfiles " ncas"

ok i try this after my coffee ^^ thanks, but however, not all files are renamed from what i see (same from your archives)

It should only rename the files with the meta content type.
I think on the latest firmware it's about 111 files.

I removed the offending keys from prod.keys where the program says "Failed to match key", but now I am getting "error section 0 is corrupted!" (or 1 instead), but 111 files are still being renamed. Should I worry about said error?

Edit: Redumped my keys and deleted the lines that were showing errors, seems to be working fine now.

#!/bin/pwsh
<#
.SYNOPSIS
Script to rename firmware update files to be compatible with Daybreak updater homebrew.
.PARAMETER path
Path to firmware dump.
Default path is current directory from which the script was called.
.PARAMETER hactool
Path to hactool.exe (get it here: https://github.com/SciresM/hactool/releases/latest).
Default path is hactool.exe in the script folder.
.PARAMETER prodkeys
Path to your console prod.keys dump (instrucitons: https://yuzu-emu.org/help/quickstart/#dumping-prod-keys-and-title-keys).
Default path is prod.keys file in the script folder.
#>
param(
    [string]$path = ".\",
    [string]$hactool = "$PSScriptRoot\hactool.exe",
    [string]$prodkeys = "$PSScriptRoot\prod.keys"
)

if (-not (Test-Path $path))
{
    throw "Path to firmware does not exist: $path"
}
if (-not (Test-Path $hactool))
{
    throw "Can't find hactool.exe using path $hactool"
}
if (-not (Test-Path $prodkeys))
{
    throw "Can't find prod.keys file using path $prodkeys"
}

$files = @(Get-ChildItem $path -Filter *.nca)
$total = $files.Length
$c = 0
foreach ($file in $files)
{
    $c++
    Write-Progress -Activity 'Renaming NCAs' -Status "Checking file $c/$total" -PercentComplete ($c * 100.0 / $total)
    $hacout = & "$hactool" -k "$prodkeys" -i "$($file.FullName)" *>&1 | Out-String
    if ($hacout -match '\bContent Type:\s+Meta\b')
    {
        if (-not $file.Name.EndsWith('.cnmt.nca'))
        {
            Get-Item $file.FullName | Rename-Item -Path "$($file.FullName)" -NewName { $file.Name -replace '.nca', '.cnmt.nca' }
            Write-Host "Renamed $($file.Name)"
        }
        else
        {
            Write-Host "Skipped $($file.Name)"
        }
    }
}
Write-Progress -Activity 'Renaming NCAs' -Completed

perfect 13xforever :)

For deejay87's "Failed to match key" issue: SciresM/hactool#79.

Also my own little script:

iterateFiles -iname '*.nca' ! -iname '*.cnmt.nca' | while read file;
  if hactool -i "$file" | grep -iP '\bContent Type:\s+Meta\b';
    echo "$file";
  end
end