The 64x48 geometry setting are working with the Wire.h and brzo_i2c libraries.
I've tested it successfully with a WEMOS D1 mini Lite and a WEMOS OLED shield
Initialization code:
- Wire
#include <Wire.h>
#include <SSD1306Wire.h>
SSD1306Wire display(0x3c, D2, D1, GEOMETRY_64_48 ); // WEMOS OLED shield
- BRZO i2c
#include <SSD1306Brzo.h>
SSD1306Brzo display(0x3c, D2, D1, GEOMETRY_64_48 ); // WEMOS OLED Shield