Add-Type -AssemblyName System.IO.Compression.FileSystem

Write-Host "Opening outer zip..."
$outerZip = [System.IO.Compression.ZipFile]::OpenRead('A:\firmware.zip')
$innerEntry = $outerZip.Entries | Where-Object { $_.Name -like '*.zip' } | Select-Object -First 1

Write-Host "Extracting inner zip: $($innerEntry.Name) ($($innerEntry.Length) bytes)"
$innerPath = 'A:\inner_firmware.zip'
[System.IO.Compression.ZipFileExtensions]::ExtractToFile($innerEntry, $innerPath, $true)
$outerZip.Dispose()
Write-Host "Inner zip extracted to $innerPath"

Write-Host ""
Write-Host "Listing boot-related files in inner zip..."
$innerZip = [System.IO.Compression.ZipFile]::OpenRead($innerPath)
foreach ($entry in $innerZip.Entries) {
    if ($entry.FullName -match 'boot|init|scatter') {
        $sizeMB = [math]::Round($entry.Length / 1MB, 2)
        Write-Host "  $($entry.FullName) - $sizeMB MB"
    }
}
$innerZip.Dispose()