Read the extensive information in this thread first before asking other forum users for help.
This thread is not intended for providing help for instructions in other people’s Youtube videos!
Both V1.2 and V1.3 are clearly described in this thread, including their differences and instructions how to get the board up and running.
If you do not want to solder DIO1 then you might try example ttn-abp.ino to use ABP.
That should probably work without DIO1 connected, ttn-otaa.ino will not work without DIO1 connected.
For normal (OTAA) operation you will have to connect/solder DIO1 anyway.
If the board says 868/915 MHz then it probably is.
It is possible (but less likely) that a 433MHz LoRa module is mounted on the board.
I find it unlikely though that the Arduino IDE would be checking whether the module is a 868/915 or 433MHz version. The 433MHz message may possibly be incorrect (caused by USB driver).
I have no experience with Arduino on Linux or OSX, but when I connect my LoRa32u4 V1.2 to a Raspberry Pi then lsusb shows it as ID 239a:800c without LoRa32u4 and without frequency. This may be different for V1.3 though (I have none to test it).