detection: Windows v149 stable identified as "Chromium-Based Browser" (Not Available version) on Fingerprint.com

[jayceftg]

Reproduction

Environment

• OS: Windows 11 x64
• Version: Fortress v149.0.7827.232 (Stable channel)

Reproduction Code (Python)

Launched the binary with the following parameters and hooked via Playwright CDP to avoid any client-side JS overrides:

import os
import subprocess
import time
from playwright.sync_api import sync_playwright

# Replace with your actual path to chrome.exe
CHROME_PATH = r"path/to/fortress/chrome.exe"

cmd = [
    CHROME_PATH,
    "--remote-debugging-port=9222",
    "--user-data-dir=C:\\tmp\\tilion_clean_profile",
    "--start-maximized",
    "--uxr-platform=Win32",
    "--uxr-ua-platform=Windows",
    "--uxr-ua-os=Windows NT 10.0; Win64; x64",
    "--uxr-ua-arch=x86",
    "--uxr-ua-bitness=64",
    "--uxr-ua-platform-version=15.0.0",
    "--uxr-ua-brand=Google Chrome",
    '--uxr-webgl-vendor=Google Inc. (AMD)',
    '--uxr-webgl-renderer=ANGLE (AMD, AMD Radeon(TM) Graphics Direct3D11 vs_5_0 ps_5_0, D3D11)',
    "--uxr-webgl-fullparams=1",
    "--uxr-screen-width=1920",
    "--uxr-screen-height=1080",
    "--uxr-timezone=America/Los_Angeles",
    "--uxr-languages=en-US,en",
    "--accept-lang=en-US,en",
    "--uxr-hw-concurrency=12",
    "--uxr-device-memory=8",
    "--uxr-canvas-seed=778899",
    "--uxr-audio-seed=445566",
    "--uxr-webrtc-policy=disable_non_proxied_udp"
]

proc = subprocess.Popen(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
time.sleep(3)

with sync_playwright() as p:
    browser = p.chromium.connect_over_cdp("http://127.0.0.1:9222")
    context = browser.contexts[0] if browser.contexts else browser.new_context()
    page = context.new_page()
    page.goto("https://fingerprint.com/demo/")
    time.sleep(10)
    browser.close()
    proc.terminate()

### Observed vs expected

### Observed (Fortress v149)
Bot and tampering checks passed, but browser identification defaulted to a generic Chromium-based browser with no version data:
```json
"browser_details": {
  "browser_name": "Chromium-Based Browser",
  "browser_major_version": "Not Available",
  "browser_full_version": "Not Available"
}

Expected (Real Chrome)

Should be identified as Chrome with matching version info:

"browser_details": {
  "browser_name": "Chrome",
  "browser_major_version": "149"
}

Potential Cause

Using the custom --uxr-* parameters (specifically the UA and brand overrides) on Windows might lead to structural issues in the high-entropy User-Agent Client Hints (UA-CH) grease/brand lists, preventing the FingerprintJS Pro server from validating the browser version.

### How you launched Fortress

Windows x64 bundle v149.0.7827.232 launched with --uxr-ua-* and AMD GPU overrides via Playwright CDP.

### Host OS and egress

Windows 11 x64, physical hardware AMD Radeon GPU, residential network.

### Confirm

- [x] I verified this reproduces on a non-datacenter IP (or IP is not the factor here).