DSO 138 Firmware Update with Arduino as Serial Programmer

Hello Community,
I have recently found out that you can update the Firmware on the JYE-Tech Digital Oscilloscope.
Because I don't have a TTL Programmer I used the Arduino and connected the Reset Pin to GND.
But the Problem is that It wont communicate with my Arduino.
In order to upgrade the firmware a special Tool from ST is needed.
In the update instructions it states that you have to use a 3.3V Programmer and connect TX, RX and GND. Am I able to use a normal Arduino Uno with resistors connected to RX and TX or do I have to buy a special programmer?