Hello!
I've been investigating a lot on the subject.
My RCZ MK1 (used) came with an aftermaket chinese android unit. It works well except that it sounds awfoul, and also don't have a way to set the time on the clock.
I've seen that with the correct canbus decoder, you can get it to work via the android unit settings.
My unit has te PSA RZ-15, which makes the stalk sound controlls work, but nothing else. Can't set the time. I bought a PSA RZ 01 which (with luck) will arrive in a month. Surely it won't turn on the jbl amp but maybe...idk...With that supposedly, you can set the time and have the stalk controls.
Also some Coneccts2 work for this. AFAIK, the Connects2 Pg007.2 work with the rcz, BUT, it doesn't turns on the JBL Amp.
I contacted Connects2 support to ask and they responded that no unit of them works with it. The problem with the JBL Amp is that it's activated via a CANBUS message, which apparently no aftermarket canbus decoder can do (apart from the original RCZ audio units). If someone has more information on this, it's hugely appreciated!

Also found the same info from a seller (the connects2 PG007.2), it stated at the bottom that work with the RCZ not amplified (so the non-JBL sound system)

So, future plans:
First, I'll reinstall the original unit RD45 (which supposedly has bluetooth, at least the monochromatic screen shows the bluetooth not found error because of the current android unit).
I may keep it that way and just use a phone holder for google maps and spotify. Will see if the stalk controls can control the music from spotify.
I lose the rear camera with this, but well...at least the parking sensors work fine.
My next option is to buy another good quiality android screen, and change the JBL amp. It will not be cheap for sure, and not even sure how that would work....
I'll keep you updated with my journey!
(So far, a freshly installed battery died after a day, yey! I'm working on it...after having that solved, I'll install the original unit and see how much different is the sound and how the stalk controls work, or maybe they don't over bluetooth connection, hope they work like any bluetooth headphones commands. If someone can confirm, great!)
I've been investigating a lot on the subject.
My RCZ MK1 (used) came with an aftermaket chinese android unit. It works well except that it sounds awfoul, and also don't have a way to set the time on the clock.
I've seen that with the correct canbus decoder, you can get it to work via the android unit settings.
My unit has te PSA RZ-15, which makes the stalk sound controlls work, but nothing else. Can't set the time. I bought a PSA RZ 01 which (with luck) will arrive in a month. Surely it won't turn on the jbl amp but maybe...idk...With that supposedly, you can set the time and have the stalk controls.
Also some Coneccts2 work for this. AFAIK, the Connects2 Pg007.2 work with the rcz, BUT, it doesn't turns on the JBL Amp.
I contacted Connects2 support to ask and they responded that no unit of them works with it. The problem with the JBL Amp is that it's activated via a CANBUS message, which apparently no aftermarket canbus decoder can do (apart from the original RCZ audio units). If someone has more information on this, it's hugely appreciated!

Also found the same info from a seller (the connects2 PG007.2), it stated at the bottom that work with the RCZ not amplified (so the non-JBL sound system)

So, future plans:
First, I'll reinstall the original unit RD45 (which supposedly has bluetooth, at least the monochromatic screen shows the bluetooth not found error because of the current android unit).
I may keep it that way and just use a phone holder for google maps and spotify. Will see if the stalk controls can control the music from spotify.
I lose the rear camera with this, but well...at least the parking sensors work fine.
My next option is to buy another good quiality android screen, and change the JBL amp. It will not be cheap for sure, and not even sure how that would work....
I'll keep you updated with my journey!
(So far, a freshly installed battery died after a day, yey! I'm working on it...after having that solved, I'll install the original unit and see how much different is the sound and how the stalk controls work, or maybe they don't over bluetooth connection, hope they work like any bluetooth headphones commands. If someone can confirm, great!)