Unlocking the bootloader itself generally does not automatically void the warranty for hardware defects.

However, Fairphone can only guarantee support for devices running the official Fairphone OS. If you experience an issue while running a third-party operating system (Custom ROM), you may be required to revert the device back to the official Fairphone OS with a locked bootloader to determine if the fault is hardware-related.

If the issue is clearly mechanical and unrelated to the software (e.g., a defective component), the warranty should still apply.

If your device is unable to boot into the operating system and the bootloader is locked, this is typically caused by a failed flash, or an attempt to lock the bootloader with an incorrect (possibly, older) software image. This can trigger the phone's anti-rollback protection.

What to do:

1. If you can still access Fastboot Mode, check the OEM unlocking status (e.g., using fastboot flashing get_unlock_ability). If it shows 1 (enabled), you might be able to manually unlock the bootloader again to attempt recovery using a factory image.
2. If the device is completely hard-bricked, or if OEM unlocking is disabled (get_unlock_ability returns 0), self-recovery is usually not possible due to security restrictions.

In cases where you cannot recover the device yourself, you will need to contact Fairphone Customer Support for assistance, as the phone may need to be sent in for repairs.

Being stuck in Fastboot mode is often a sign of a failed installation or an issue with the boot sequence.

Recovery Steps (for unlocked bootloaders):

1. Try simple commands first, such as selecting the alternate boot slot (fastboot --set-active=b) and then rebooting (fastboot reboot).
2. If the bootloader is unlocked, you can usually try to manually re-flash the official Fairphone OS or the custom OS you intended to install using Fastboot commands. Fairphone provides official guides for manual installation of its operating system. Visit How to manually install Android on your Fairphone to learn more.

If the problem persists after attempting a manual re-flash, or if you are unsure of the next command, contact Fairphone Customer Support for guidance, as incorrect commands can lead to the device being fully bricked.

The unlock code is generated uniquely for your device's IMEI and Serial Number. If the code is not working, it's typically due to an input error, or a technical glitch:

1. Check for Typos: Carefully double-check that you have entered the correct IMEI and Serial Number into the code generator. Be wary of similar characters (e.g., '0' and 'O').
2. Verify Codes: If you have requested multiple codes, ensure you are using the most recently generated code, as older codes are invalidated when a new one is requested.
3. Connectivity: Ensure your phone is connected to the internet (via Wi-Fi or mobile data) and running the latest Fairphone OS update when attempting to enter the code in the Developer Options.

If you have verified the IMEI, serial number, and connectivity, but the form fails to generate a code/ the code you received still fails, contact Fairphone Customer Support for troubleshooting and potential manual code verification.

The process of unlocking and re-locking your bootloader is covered in detail in our official support article, which includes all necessary prerequisite steps and the exact Fastboot commands. Please follow the comprehensive, step-by-step instructions provided here.