please help me on this error

Hi Laird and Focusbug users! I'm trying to install the new firmware on my CineRT but I think I'm doing something wrong. I have followed the steps described on the video (I'm using a Mac) but it does not seem to work. Here is a screenshot of the error I'm getting:

I'm going to start watching the almost 3 hour tutorial that you uploaded at FPAW but if by any means you know a quick fix for it or we can have a quick chat to help throw some light into this, it would be greatly appreciated! Thanks!

I just updated the firmware and my base and HS have become unpaired. The HS tells me to input the pairing code, but my base is not flashing one upon startup. Base is stuck on channel 1A and I get a "channel in use" message on my handset. I've tried re-loading the firmware with no luck. I was able to revert the HS to legacy firmware, but the base will not accept the old FW.

We are excited to announce the release of our new Version 21 Firmware coming March 1, 2022. V.21 will be available free from our website for Cine RT Systems with Data & Accessory Ports. Clients with older systems can add these ports to their Cine RTs with the Retrofit, a modification that is backward compatible with all systems. A PRG-100 Programmer is required to connect your Cine RT System via USB to professional Lemo connectors.

The new firmware contains a host of refinements to menu operations, display formatting, and system alerts. We have also made it our mission to rework the core Rangefinder to improve data speed and stability. It has been our pleasure to collaborate with several major lens control system manufacturers to provide faster serial protocol speeds, as well as bi-directional communications for the new Arri Hi-5.

Version 21 unlocks these new Serial Output options and offers the…