Greyed out Wi-Fi and Bluetooth on an iPhone 13 Pro Max is a known hardware-related issue (often caused by a failed chip or logic board connection), but here are all the paths to help you erase it and remove Find My without needing Wi-Fi:
Option 1 — Erase directly on the iPhone (no internet needed):
- Go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings
- Enter your passcode when prompted
- This erases the device locally without needing Wi-Fi — Find My will be turned off during this process if you enter your Apple ID password
- Note: You will need your Apple ID credentials to complete the erase if Find My is on
Option 2 — Remove the device from iCloud remotely (using your new iPhone or any browser):
- On your new iPhone 17 Pro Max or any browser, go to icloud.com/find
- Sign in with the same Apple ID
- Tap "All Devices" > select the iPhone 13 Pro Max
- Tap "Erase iPhone" and then "Remove from Account"
- This remotely wipes and removes Find My from the device, even without the phone having Wi-Fi right now (it will execute the erase when the phone next connects to any network, including cellular)
Option 3 — If the phone has a cellular data connection:
- Even if Wi-Fi and Bluetooth are greyed out, the phone may still have cellular data
- The remote erase from iCloud.com will trigger over cellular
- You can also try: Settings > [Your Name] > Sign Out (while on cellular) to remove the Apple ID
Option 4 — Use Recovery Mode via Mac/PC:
- Connect iPhone to Mac (Finder) or PC (iTunes)
- Put it into Recovery Mode: quickly press Volume Up, Volume Down, then hold Side button until recovery screen appears
- Choose Restore in Finder/iTunes — this fully erases the device and removes Find My (you will need your Apple ID to complete activation lock removal)
The most efficient path is Option 2 — remotely erase and remove the device from iCloud.com using your new iPhone.