Maginon WT-1 new Version?

[dermigoe]

What happened?

Hello,
I ordered a Maginon WT-1 thermostat and apparently something has been changed in the hardware.
It looks a little different than in the manufacturer's pictures and is recognized in zigbee2mqtt like this:

Device type
EndDevice
Zigbee Model
TS0601
Zigbee Manufacturer
_TZE204_p1qrtljn
Description
Smart radiator valve
Support status
Supported
Manufacturer
TECH
Model
VNTH-T2

The picture on the zigbee2mqtt device page matches the thermostat I have.

BUT:
Unfortunately there are 2 problems with it.

1. I can't switch the system_mode to "auto". There is only "heat" and "off".
2. When I use the preset "schedule" the target temperature jumps to 153.6°C. The problem has already been described here for another thermostat: AVATTO ME168 - bad temperature values when schedule is selected #19787

I (a layman) then tried to create an external converter and change it. To do this, I copied the contents of zigbee-herdsman-converters/src/devices/tech.ts into the file and then only changed the description to see if it worked. I then saved this file under tech2.js in the path data/external_converters and restarted zigbee2mqtt.
Unfortunately I was unsuccessful.
Is this because the thermostat is already supported?
Or do you have an idea how I can get the external converter to work?

Greetings and thanks

What did you expect to happen?

No response

How to reproduce it (minimal and precise)

No response

Zigbee2MQTT version

2.0.0 commit: 060ae99

Adapter firmware version

20240710

Adapter

SONOFF Zigbee 3.0 USB Dongle Plus ZBDongle-P

Setup

plain on a Raspberry Pi 3 Model B

Debug log

No response