Ver. 4.2.1

■ 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. 4.1.0

EW-EX310 is now supported.

Ver. 4.0.1

Firmware released.