[Need Help] ATtiny13 with 128x64 OLED

[Jimmy-arduino]

I am testing with the code for ATtiny13 version.
Does anyone know how to modify the code to apply it to 128x64 OLED?
I have read about using OLED, but it is too difficult for me to understand, so I cannot solve it by myself.
I need to use 128x64 instead of 128x32, so please help me.
For reference, I changed the set multiplex related value in the code from 0x1F to 0x3F, but it did not work.

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// OLED init settings
const uint8_t OLED_INIT_CMD[] PROGMEM = {
0xA8, 0x3F, // set multiplex (HEIGHT-1): 0x1F for 128x32, 0x3F for 128x64

[wagiminator]

Does it show nothing or garbage?

[Jimmy-arduino]

It showed something, but I can't read it properly.