Firmware update for EF to RF(EOS R) Speed Booster ULTRA (Linux)

Firmware upgrade for Canon EF - RF(EOS R) T Speed Booster ULTRA®

 

RELEVANT PRODUCTS

This information is for the following models:

  • Canon EF to RF (EOS R) T Speed Booster® ULTRA 0.71x (MB_SPEF-EFR-BT1)

  • Canon EF to RF (EOS R) T Speed Booster® ULTRA 0.71x CINE (MB_SPEF-EFR-BT2)

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 V2.50 (#2124) for Canon EF to RF (EOS R) T Speed Booster® ULTRA
  • Release date:  22 Dec 2025
  • Benefits and improvements: 
    • Fixed unresponsive autofocus issue with Tamron 35-150mm F/2.8-4 VC USD model A043 on EOS C70 firmware v1.1.1.1. Note that this fix is exclusive to Metabones EF-RF Speed Boosters and the hang issue may still occur with other adapters.
    • Fixed issue when Canon EF-S 18-135mm f/3.5-5.6 IS USM a.k.a. "NANO USM" is used with Power Zoom Adapter PZ-E1, the green LED of the PZ-E1 does not go off while the camera is turned off. Metabones Speed Booster reports itself as a cropped APS-C lens.
    • By default, Metabones Speed Booster reports itself as a cropped APS-C lens. This was not consistent in previous versions but only with newer lenses. This is now fixed and consistent across the board. This behaviour can be disabled by a setting in Metabones App.

 

 

FIRMWARE HISTORY: 

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

 

 

 

 

REQUIREMENTS:

  • Operating System: most variants of Linux, 64-bit Intel
  • Micro-USB cable required.
  • Linux requires giving permission to access USB devices. Metabones App will copy the file /etc/udev/rules.d/99-metabones.rules to your system. You will be asked to provide your administrator password the first time you run Metabones App. To remove Metabones App from your system completely, manually delete the file.

 

 

IMPORTANT NOTES:

  • When performing the firmware update, please 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 cameara and lens when performaing the firmware update.

 

 

How to download the firmware updater:

  1. Make sure that you are logged on as a user with administrative rights.
  2. At the bottom of the page, read the disclaimer and agree to the terms and conditions by clicking on the checkbox. Then, click on the Download button.
  3. The download of MetabonesAppVx.xx file will start.

 

 

RUN THE SOFTWARE

Once the file has downloaded successfully, you're ready to upgrade the firmware of your Speed Booster or Smart Adapter.

  1. As a securty precaution, verify the SHA256 checksum of the file before running it.
  2. SHA256 checksum (Linux): 8b8b5f5279a95628c60230661ce785ab65c5e2fdbf669694a9bbf3fa731418a5
  3. Use chmod to add the execution bit u+x to the file.
  4. Run MetabonesAppVx.xx. No installation is needed.
  5. Connect your Speed Booster or Smart AdapterTM to the computer using a Micro-USB cable.
  6. Follow the instructions in the Metabones App to update the firmware.

 

 

End User License Agreement (EULA)

Metabones App, hereinafter referred to as App, is licensed to you ("User") by Global Boom International Limited ("Metabones") on a single-user, non-transferable, non-exclusive, revocable basis. App shall be used only with Metabones products and only as specified in this End-User License Agreement ("EULA"). User may not reproduce, copy, rent, lease, reverse engineer, decompile or sell App or the accompanying online documentation, except to the extent expressly permitted by the EULA or by applicable law. Unauthorized use of App violates copyright and other intellectual property rights and Metabones and/or the relevant licensor (as appropriate) reserve(s) all rights. User acknowledges and understands that App is capable of reproducing copyrighted material by means of its Update function and use of said Update function on, for or with non-Metabones product(s) constitutes willful copyright infringement, subject to civil and/or criminal prosecution. Metabones does not give any Warranty with regard to the accuracy or reliability of the results or output that derives from the download, installation or use of App. Metabones does not accept any responsibility for loss of data or damage caused by the download, installation or use of App, or give any other warranty, or accept any liability whatsoever with respect to App. Metabones recommends that User (and User warrants that (s)he shall) always create and retain a copy of all data in hardware, with or in which App will be downloaded, installed or used, before downloading, installing or using App. Metabones and Metabones's Affiliates do not (except as specifically stated in an applicable EULA, if at all) offer support or assistance in using, installing or maintaining App, or resolving issues or problems that may occur as a result of downloading, using or installing App. You acknowledge that the App, and any accompanying documentation and/or technical information, may be subject to applicable export control laws and regulations. You agree not to export or re-export the App, directly or indirectly, in breach of any such laws or regulations. Where Metabones agrees (in writing) to provide technical support in relation to App or a Metabones product, it shall only provide that support on App or the relevant Metabones product in the same form and version as shipped from the Metabones or Metabones's affiliate's factory, which has not been subject to alteration, modification or abuse and which has been used in accordance with the accompanying online documentation. Metabones does not provide technical support to any non-Metabones product, notwithstanding any representation made by Metabones or Metabones' affiliates of compatibility with a Metabones product. Applicable EULA's may impose additional warranty and liability exclusions or limitations on App. The download, installation or use of App constitutes acceptance of these Terms. If you do not agree with these Terms, you may not download, install or use App or the accompanying online documentation.

 

 

 

 I have read the above End User License Agreement (EULA) and agree to the terms and conditions.