I did continue to try an get an answer - and eventually I did - though its gobbledegook - Here is the reply
"it works fine then doesn't have the problem ,if your frunk have same functional issues, you can add my what'sapp:+8613044219654, i will let the frunk engineer help you"
So that was clear as mud.
I did contact EV accessories - the business I bought the kit from - Nigel, Indicated he would elicit a reply from Hansshow but thinks the flashing light is simply an indication its powered - that was weeks ago and no reply. It all remains working fine. I can only conclude with Hansshow you are on your own - god help me if i need to claim on the warranty. ----------BUT --- did I listen to myself? - Nah - I also bought the Trunk powered system.
So, Trunk Version 7 - again, nothing like the version 7 I've seen on YouTube - my kit only requires one lead to fish through to the boot lid - and its a small plug that actually passed through the plastic trunking like throwing a sausage up an entry - I was braced for a pig of a time trying to wangle it through - but I pulled firmly and the cable jut flew through with just one tug - I did give the tubing a spray with WD40 Silicon prior to the pull - perhaps I got lucky.
Anyway - Inside the boot lid there is now a tiny control box this one cable connects to and from that control box are the three connections for the boot release button, the lock motor and the new button I fitted to close the boot, It was super easy. indeed the easiest part of the job. There is no connection now to the rear light clusters and the new close button has returned to the rectangle shape
I removed the rear bumper to do a proper install - I see some that pass the cables from the struts through the rear light electrical connection hole, also see the cable pushed through the gap between the bumper and the body of the car - and the cables brought in via the two holes in the back panel with grommets already in - which i guess is fine but I wanted those holes for my new rear reflectors in the bumper that illuminate and have sequential Indicators built in. The Model 3 has a grommet on the right hand side below the light cluster and to the right, quite low down and removing Tesla's grommet revealed a 20mm hole - which is the same size as the grommet fitted by Hansshow to the strut cables - the right strut cable didn't require the extension that is supplied in the kit because the control box is fitted to the right hand side just below the light cluster and its long enough to connect to the control box. The left hand side - my car had an indent in the steel in the same place as the grommet hole on the right - so i drilled a 20mm hole with a step drill and passed the cable through that. There is a video online that shows this method -
The suction motor is a small thing and mine located just below the boot lock catch - behind the carpet of the lower boot section.
The last two jobs were to connect power and connect to the CAN bus, I powered down the car on the screen and let it sit 5 minutes before i made any connections. 12V from the connection under the rear seat - next to the high voltage plug - which i pulled after powering down the car whilst i made that connection. Once power was connected i connected the CAN bus then re-plugged in the high voltage and pressed the brake pedal to wake the car back up.
This control box also has a flashing red light - and this kit too all worked first time out the box, no issues at all.