Ver. 4.2.2

■ Changes
Security performance for wireless communications between the shifter and rear derailleur has been improved.
Click here to view FAQs for more information. https://bike.shimano.com/faq/DI20A#D-7030
*The firmware for both the shifter and rear derailleur must be updated for proper operation of the Di2 system.
* Wireless firmware update is not available for this product.
Update the firmware over a wired connection or contact your place of purchase or a distributor.
■ Others
General bug fixes.

Ver. 4.2.0

- The FRONT SHIFT NEXT function is now supported.
It is a function that allows you to shift up and down the front derailleur with a single button.
* To use this function, assign “FRONT SHIFT NEXT” to a button on the wireless shifter/switch.
* Wireless firmware update is not available for this product.
Update the firmware over a wired connection or contact your place of purchase or a distributor. Click here to view FAQs for more information.(https://bike.shimano.com/faq/DI20A#D-7020)

Ver. 4.1.2

EW-EX310 is now supported.

Ver. 4.1.1

Adapted for new DU-EP801/DU-EP600.

Ver. 4.0.3

Pairing operation process of rear derailleur and dual control lever of some units cannot be completed, when the firmware version of ST-R8170 is lower than ver. 4.0.2.
If pairing operation process cannot be completed, use one of below applications to update the firmware version of ST-R8170 to ver. 4.0.3 or higher.
* Following is the firmware updating procedure of each application, E-TUBE PROJECT Professional Ver.5.0.2 or higher, or E-TUBE PROJECT Cyclist Ver.5.0.2 or higher.
Procedure using the E-TUBE PROJECT Professional:
* Use SM-PCE02 to connect the PC and the dual control lever by wire, next, update the firmware, and finally do the pairing.
* In case SM-PCE02 is not available, please contact the place where you purchased the product.
Update: https://si.shimano.com/iUM/7J4WA/update/toc_task_nnp_xs2_g4b
Pairing: https://si.shimano.com/iUM/7J4WA/pairing_process/TOC_PAIRING_PROCESS
Procedure using the E-TUBE PROJECT Cyclist:
* Connect the rear derailleur and the dual control lever by wire, next, update the firmware, and finally do the pairing.
Update: https://si.shimano.com/iUM/7J4WA/update/toc_task_nnp_xs2_g4b
Pairing: https://si.shimano.com/iUM/7J4WA/pairing_process/TOC_PAIRING_PROCESS

Ver. 4.0.2

Firmware released.