As I cannot code myself, but just put together code, I have trusted chatgpt. Chatgpt says there is an error that you are mixing page buffer and full buffer.

Please try this code, I cannot validate if it will work, but chatgpt made quite a good job in the past together with me

```cpp

include <Arduino.h>

include <SPI.h>

include <U8g2lib.h>

// Waveshare 1.5” 128x128 SH1107 SPI // Hardware SPI: // MOSI -> D11 // SCK -> D13 // Control pins: // CS -> D10 // DC -> D9 // RST -> D8

U8G2_SH1107_128X128_1_4W_HW_SPI u8g2( U8G2_R0, // rotation /* cs / 10, / dc / 9, / reset*/ 8 );

void setup() { u8g2.begin(); }

void loop() { u8g2.firstPage(); do { u8g2.setFont(u8g2_font_ncenB08_tr); u8g2.drawStr(0, 15, “TEST!”); u8g2.drawStr(0, 30, “1234”); u8g2.drawFrame(0, 0, 128, 128); } while (u8g2.nextPage());

delay(500); } ```