The v3.0 I purchased has the red interface. My original v2.0 had a Green interface (that unit got bricked about a month ago doing an OTA update)... I know I have the v3.0 as opposed to a v2.0 device since the new unit is now wireless AC/WiFi5. My previous v2.0 as well as my original replacement order (which arrived with the Red UI same appearance as the v3.0-WiFi5) both had Wireless N/WiFi4.
I did all steps being powered off my MacBook Pro charger. I was messing around for so long, I didn't want to keep my truck idling for that long, not to mention, I wanted to keep my WiFi Explorer open so I could watch that status of the SSID as it changed, disconnected, rebooted, etc. Because it wasn't powered/connected to my head unit, I couldn't actually see what the device was doing... Just relied on the LED/status light, and some courage... hahaha
If there's a certain step or update between two versions where it would be beneficial to watch the head unit display, let me know. I'd be more than happy to get some screenshots of the updates from the head unit. I just want to stage it before doing all the steps. Likewise, if it would help -- I can crack open the case to verify chip components, etc..
My simple definition of the two devices:
v2.0 == WiFi 4/Wireless N w/ 40MHz, RealTek chip. v2.0 can be upgraded to run the same Red UI, although my original unit never switch UI, always had green even with the 2021 OTA updates.
v3.0 == WiFi 5/Wireless AC w/ 80MHz, Per @VLud it's a Broadcom chip. I also believe these units are shipping with the Red UI only.
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This all jives with my experiences as well... been battling it for a few weeks now, trying to install the custom firmware so I can install my custom UI. It seems like they made the v3.0 devices non-rollbackable -- only can install 2020.03.06. Anything earlier won't install. That is probably their new "fail safe" and to protect hacking and easy for them to handle/check in their code.