Firmware update for EF to X Speed Booster ULTRA (Windows)

Firmware upgrade for Canon EF to Fuji X mount  T Smart Adapter^TM and EF-E Speed Booster^® ULTRA 0.71x

RELEVANT PRODUCTS

This information is for the following models:

• Canon EF to Fuji X T Speed Booster® ULTRA 0.71x (MB_SPEF-X-BT1)

• Canon EF to Fuji X T CINE Speed Booster® ULTRA 0.71x (MB_SPEF-X-BT2)/ Mark II (MB_SPEF-X-BT3)

• Canon EF to Fuji X T Smart Adapter^TM (MB_EF-X-BT1)

• Canon EF to Fuji X T CINE Smart Adapter^TM (MB_EF-X-BT2)/ Mark II (MB_EF-X-BT3)

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

ABOUT THIS DOWNLOAD

• Name: Firmware update V1.60 (#1780) for EF-X T Speed Booster® ULTRA 0.71x/ Smart Adapter^TM
• Release date: 24 April 2025
• Benefits and improvements: 
  • Improved startup/shutdown stability.
  • Fixed iris cannot go beyond T18 (Speed Booster) or T26 (Smart Adapter) when 1.5x built-in extender of Canon CN10x25 (25-250mm) cinema lens is engaged when minimum should have been T22 and T32 respectively.
  • Maximum aperture is now displayed as F4 instead of F4.2 with EF70-200mm f/4L IS II USM.
  • Fixed issue with computer not going to sleep while Metabones App is left open.

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

A micro-USB cable is required to connect the Smart Adapter^TM 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.