If you received your G400 before the bootloader was released or your G400 arrived without it, you can flash it to your device by following the steps below. This process may only be completed for the 2016 R1 SDK and later. Earlier SDKs do not contain a loader compatible with the bootloader.
To determine if your G400 already has the bootloader installed on it, you may hold LDR0 and LDR1 low and then reset the system. If in serial mode at 115,200 baud, a banner will be sent over COM1. If in USB mode, a virtual COM port will appear in the Device Manager.
If the bootloader is not installed, follow the below steps to install it.