With the TX OFF, plug a USB cable into an available USB slot on your computer. If you have both USB2 and USB3 ports available, the safest thing to do probably is to try the USB2 port first. The latest version of Zadig is supposed to take care of that little “undocumented feature” in Windows, but it never hurts to maximize your chances of success. Wait a few seconds to give your machine time to recognize the new device.Watch Scott’s video: Upgrading to v2.0.This section will walk you through how to check to see if you have a working copy of STM 32 BOOTLOADER already installed on your computer. Using Zadig Checklist Step #1: Do You Already Have A Working STM32 Bootloader? If you’ve been using Companion 9X to update your firmware (not just work with the EEPROM, but update the firmware), you’ve already got a working bootloader. However, from time to time, Windows seems to exhibit a mind of its own, and the bootloader won’t install when you plug in your transmitter. If that happens, you need to re-run Zadig. Windows will not automatically install the driver we wish to use with OpenTX Companion the first time you connect your transmitter to your computer. You’ll need to download and run a little program called Zadig to get the correct driver and register it in the Windows registry. NOTE2: TX is sometimes used as a shorthand form of 'transmitter.' NOTE 3:Click HERE for a copy of the Using Zadig Notes and Checklist PDF!

However, I still recommend that you install it, as updating the radio through Companion with the TX off is considered the preferred method for upgrading as it ensures that both the firmware and the bootloader are updated. If you have one of these transmitters, it is not necessary to have Zadig installed to update the firmware only. The newer Taranis Plus radios ship with FrSky's proprietary version of OpenTX v2.+ that has a bootloader installed.

Another way is by using progrmmer's trick called a shell, but that’s something that’s beyond most of us. Using Zadig, or, Avoiding Zadig Hell NOTE 1: At this time, a working STM 32 Bootloader driver is the only way Windows computers will update OpenTX to v2.x and above the first time from either an earlier version of OpenTX [pre-V2.0)or another firmware package such as FrSky's OEM version.

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