# High-End System Repair Enhancements

## Overview
Enhanced `winload.efi` repair logic to handle complex scenarios on high-end systems (i9-14900K, Z790, multiple NVMe drives).

## Implemented Features

### 1. BitLocker Unlock Validation ✅
- **Function**: `Test-BitLockerUnlocked`
- **Location**: `DefensiveBootCore.ps1`
- **Purpose**: Checks if BitLocker is unlocked before running any `bcdboot` commands
- **Behavior**: 
  - Returns `$true` if drive is unlocked or BitLocker is not active
  - Returns `$false` if drive is locked
  - Blocks repairs if locked and provides unlock command

### 2. Deep Repair (Nuke and Pave) ✅
- **Function**: `Repair-BCDDeepRepair`
- **Location**: `DefensiveBootCore.ps1`
- **Purpose**: Performs aggressive repair by formatting EFI partition and rebuilding BCD from scratch
- **Steps**:
  1. Assigns letter to EFI partition
  2. Backs up existing BCD (if present)
  3. Formats EFI partition as FAT32
  4. Runs `bcdboot` with `/f UEFI` and `/addlast` flags
  5. Verifies BCD was created and points to correct `winload.efi`
- **Safety**: Requires `-ConfirmFormat` switch to prevent accidental data loss

### 3. Enhanced Drive Mapping ✅
- **Function**: `Find-SystemRootByWinload`
- **Location**: `DefensiveBootCore.ps1`
- **Purpose**: Finds correct SystemRoot by searching for `winload.efi` instead of assuming C:
- **Behavior**:
  - Searches all available drives for `winload.efi`
  - Prefers specified drive if found, otherwise uses first match
  - Warns if multiple drives contain `winload.efi`
  - Returns drive letter, path, confidence level, and details

### 4. VMD Driver Detection and Warning ✅
- **Function**: `Test-VMDDriverLoaded`
- **Location**: `DefensiveBootCore.ps1`
- **Purpose**: Checks if Intel VMD/RST drivers are loaded when VMD is detected
- **Behavior**:
  - Detects Intel VMD controller via WMI
  - Checks if RST/VMD driver is loaded
  - Warns if VMD detected but driver not loaded
  - Provides solution: `drvload <path>\iaStorVD.inf`

### 5. Disk Signature Collision Detection ✅
- **Function**: `Test-DiskSignatureCollision`
- **Location**: `DefensiveBootCore.ps1`
- **Purpose**: Detects duplicate disk signatures from cloned drives
- **Behavior**:
  - Scans all disks for unique signatures
  - Detects duplicates
  - Warns that UEFI firmware may be confused about which drive to boot
  - Lists all duplicate signatures found

## Enhanced Repair Functions

### `Repair-BCDBruteForce` (Enhanced)
- **New Parameters**:
  - `-DeepRepair`: Enables deep repair mode (formats EFI partition)
  - `-ConfirmFormat`: Confirms format operation (safety check)
- **Pre-flight Checks**:
  1. BitLocker unlock validation
  2. VMD driver warning
  3. Disk signature collision warning
- **Enhanced `bcdboot` Command**:
  - Added `/addlast` flag to ensure entry is added correctly
  - Uses `/f UEFI` for UEFI-specific boot file creation

### Standard Repair Flow (Enhanced)
- All `bcdboot` calls now check BitLocker status first
- VMD warnings displayed before repair attempts
- Disk signature collision warnings displayed
- Enhanced error messages with specific unlock commands

## Integration Points

### `Invoke-DefensiveBootRepair`
- BitLocker check before standard `bcdboot` rebuild
- VMD and disk signature warnings displayed

### `Invoke-BruteForceBootRepair`
- BitLocker check before brute force repair
- Enhanced `Repair-BCDBruteForce` call with pre-flight checks

## Usage Examples

### Standard Repair (with BitLocker check)
```powershell
# Automatically checks BitLocker before running bcdboot
Invoke-DefensiveBootRepair -WindowsDrive "C" -Mode "ExecuteRepairs"
```

### Deep Repair (format EFI and rebuild)
```powershell
# Format EFI partition and rebuild BCD from scratch
Repair-BCDDeepRepair -TargetDrive "C" -EspLetter "S" -ConfirmFormat
```

### Find SystemRoot by winload.efi
```powershell
# Find correct drive containing winload.efi
$systemRoot = Find-SystemRootByWinload -PreferredDrive "C"
Write-Host "SystemRoot: $($systemRoot.Drive):"
```

### Check VMD Driver
```powershell
# Check if VMD driver is loaded
$vmdCheck = Test-VMDDriverLoaded
if ($vmdCheck.VMDDetected -and -not $vmdCheck.DriverLoaded) {
    Write-Host "WARNING: Load Intel RST driver"
}
```

## Error Messages

### BitLocker Locked
```
❌ BLOCKED: BitLocker is locked on C:
   Unlock the drive first: manage-bde -unlock C: -RecoveryPassword <KEY>
```

### VMD Driver Missing
```
⚠ WARNING: Intel VMD detected but RST driver not loaded
   This may cause bcdboot to fail silently
   Solution: Load Intel RST driver: drvload <path>\iaStorVD.inf
```

### Disk Signature Collision
```
⚠ WARNING: Duplicate disk signatures detected
   UEFI firmware may be confused about which drive to boot
   - Signature <sig> found on Disk 0 and Disk 1
```

## Testing Recommendations

1. **BitLocker Testing**:
   - Test with BitLocker locked drive
   - Test with BitLocker unlocked drive
   - Test with BitLocker not active

2. **VMD Testing**:
   - Test on Z790 system with VMD enabled
   - Test with RST driver loaded
   - Test with RST driver not loaded

3. **Disk Signature Testing**:
   - Test with cloned drives
   - Test with unique signatures
   - Test with multiple Windows installations

4. **Deep Repair Testing**:
   - Test with existing BCD
   - Test with corrupted BCD
   - Test with missing BCD
   - Verify backup is created before format

## Future Enhancements

1. **Automatic VMD Driver Loading**:
   - Search for `iaStorVD.inf` in common locations
   - Automatically load driver if found
   - Provide download link if not found

2. **Disk Signature Fix**:
   - Automatically generate unique signatures for duplicate disks
   - Use `diskpart > uniqueid disk` to fix collisions

3. **Enhanced SystemRoot Detection**:
   - Use registry hives to find SystemRoot
   - Check BCD entries for drive references
   - Cross-reference multiple detection methods

## Files Modified

- `DefensiveBootCore.ps1`: Added all new functions and enhanced existing repair logic

## Related Documentation

- `FLAWS.MD`: Original flaw analysis
- `ULTIMATE_HARDENING_PLAN.md`: Comprehensive hardening plan
- `BRUTE_FORCE_IMPLEMENTATION_SUMMARY.md`: Brute force repair details
