For general development, debugging, and app testing, use the official Google Android SDK Platform Tools (ADB and Fastboot). These do not require any proprietary login credentials.
If your HMD kit runs a Linux-based OS (e.g., many ARM debug boards), you can often reset the password without a full wipe: hmd device kit username and password free
If your HMD device kit is used for a single, specific purpose—such as a specific flight simulation or a localized medical training module—you do not need user authentication at the OS level. For general development, debugging, and app testing, use