Firmware update for EF-M43 (Windows)

Firmware upgrade for Canon EF-Micro Four Thirds Smart AdapterTM

 

RELEVANT PRODUCTS

This information is for the following models:

  • Canon EF-BMCC T Speed Booster® (model : MB_SPEF-BMCC-BM1/MB_SPEF-BMCC-BT1)
  • Canon EF-BMPCC T Speed Booster® 0.58x (model : MB_SPEF-BMPCC-BM1/MB_SPEF-BMPCC-BT1)
  • Canon EF-BMPCC4K T Speed Booster® ULTRA 0.71x (model : MB_SPEF-m43-BT8/CINE: MB_SPEF-m43-BTA)
  • Canon EF-BMPCC4K T Speed Booster® XL 0.64x (model : MB_SPEF-m43-BT9/CINE: MB_SPEF-m43-BTB)
  • Canon EF-Micro Four Thirds Smart AdapterTM (model : MB_EF-M43-BM1)
  • Canon EF-Micro Four Thirds T Smart AdapterTM (model : MB_EF-M43-BT2)
  • Canon EF-Micro Four Thirds T Smart AdapterTM II (model : MB_EF-M43-BT4)
  • Canon EF-Micro Four Thirds T Smart AdapterTM CINE (model : MB_EF-M43-BT3)
  • Canon EF-Micro Four Thirds Speed Booster® (model : MB_SPEF-M43-BM1)
  • Canon EF-Micro Four Thirds Speed Booster® "S" (model : MB_SPEF-M43-BM2)
  • Canon EF-Micro Four Thirds T Speed Booster® ULTRA 0.71x  (model : MB_SPEF-M43-BT4/CINE: MB_SPEF-M43-BT5)
  • Canon EF-Micro Four Thirds T Speed Booster® XL 0.64x  (model : MB_SPEF-M43-BT3/ CINE: MB_SPEF-M43-BT6)
  • Canon EF-Micro Four Thirds T Speed Booster® ULTRA 0.71x II  (model : MB_SPEF-M43-BTC)
  • Canon EF-Micro Four Thirds T Speed Booster® XL 0.64x II  (model : MB_SPEF-M43-BTD)
  • Canon EF-Micro Four Thirds T Speed Booster® SUPER16 0.58x  (model : MB_SPEF-M43-BT7)

 

Disclaimer: These release notes only highlight significant changes to the firmware. There may have been other changes that are not documented.

 

ABOUT THIS DOWNLOAD

  • Name: Firmware update V5.00 (#2228) for Canon EF to Micro Four Thirds Smart AdapterTM/Speed Booster® 
  • Release date: 10 Feb 2026
  • Benefits and improvements: 
    • Metabones App now runs natively on Windows on Arm.
    • Fixed regression of incorrect maximum aperture, EXIF focal length and IBIS when using teleconverters.

 

FIRMWARE HISTORY

  • More firmware history can be viewed in the archive: here

 

SYSTEM REQUIREMENTS:

Operating Systems

The latest version of the firmware update is compatible with most commonly-used versions of Microsoft Windows:

  • Windows® 10 1809 or newer (64-bit)
  • Windows® 11
  • Windows® 11 on Arm

A micro-USB cable is required to connect the Smart AdapterTM or Speed Booster® to the computer.

While performing the firmware update, don't disconnect the USB cable, otherwise, the adapter may become inoperable due to sudden disconnection. In most cases, an adapter made inoperable by an interrupted firmware update can be fixed by performing the firmware update again.

Don't connect the adapter to any camara or lens while performing the firmware update.